Transfer all Preset fields from cache via move assignmet

apply_vendor_preset_group was copying fields manually and missed
bundle_id, user_id, base_id, sync_info, updated_time, key_values,
ini_str. Replace field-by-field copy with move assignment of the
fully-deserialized Preset, then restore the vendor pointer which
is excluded from serialization.

.github/workflows/build_orca.yml

@@ -144,6 +144,15 @@ jobs:
         run: |
           ./build_release_macos.sh -s -n -x ${{ !vars.SELF_HOSTED && '-1' || '' }} -a ${{ inputs.arch }} -t 10.15
 
+      - name: Generate system presets cache (macOS)
+        if: runner.os == 'macOS' && !inputs.macos-combine-only
+        working-directory: ${{ github.workspace }}
+        shell: bash
+        run: |
+          tool=$(find build/${{ inputs.arch }} -name generate_system_cache -type f | head -1)
+          profiles=$(find build/${{ inputs.arch }} -path "*/Resources/profiles" -type d | head -1)
+          "$tool" --path "$profiles" --log_level 2
+
       - name: Pack macOS app bundle ${{ inputs.arch }}
         if: runner.os == 'macOS' && !inputs.macos-combine-only
         working-directory: ${{ github.workspace }}
@@ -340,6 +349,23 @@ jobs:
           if ($arch -eq "arm64") { .\build_release_vs.bat slicer arm64 } else { .\build_release_vs.bat slicer }
         shell: pwsh
 
+      - name: Generate system presets cache (Windows)
+        if: runner.os == 'Windows'
+        shell: pwsh
+        run: |
+          $buildDir = $env:BUILD_DIR
+          $tool = Get-ChildItem -Recurse -Path $buildDir -Filter "generate_system_cache.exe" | Select-Object -First 1
+          if (-not $tool) { Write-Error "generate_system_cache.exe not found in $buildDir"; exit 1 }
+          $profiles = Get-ChildItem -Recurse -Path $buildDir -Directory -Filter profiles |
+            Where-Object { $_.FullName -match 'resources' } | Select-Object -First 1
+          if (-not $profiles) { Write-Error "profiles directory not found in $buildDir"; exit 1 }
+          # Add the slicer's runtime DLL directory to PATH so generate_system_cache.exe
+          # can resolve its dependencies (TKernel.dll etc.) without a full install step.
+          $dll_dir = Get-ChildItem -Recurse -Path $buildDir -Filter "TKernel.dll" |
+            Select-Object -First 1 | Select-Object -ExpandProperty DirectoryName
+          if ($dll_dir) { $env:PATH = "$dll_dir;$env:PATH" }
+          & $tool.FullName --path $profiles.FullName --log_level 2
+
       # NSIS is x86-only; it runs (and the installer it emits runs) under ARM64's
       # x86 emulation, packaging the native arm64 payload from build-arm64.
       - name: Create installer Win
@@ -477,6 +503,22 @@ jobs:
           retention-days: 5
           if-no-files-found: error
 
+      - name: Generate system presets cache (Linux)
+        if: runner.os == 'Linux'
+        shell: bash
+        run: |
+          tool=$(find build -name generate_system_cache -type f | head -1)
+          if [ -z "$tool" ]; then echo "ERROR: generate_system_cache not found in build tree" >&2; exit 1; fi
+          "$tool" --path build/package/resources/profiles --log_level 2
+          # Re-pack the AppImage so the per-vendor caches are included
+          appimage=$(find build -maxdepth 1 -name "OrcaSlicer_Linux_AppImage*.AppImage" | head -1)
+          chmod +x "$appimage"
+          "$appimage" --appimage-extract
+          cp build/package/resources/profiles/*.cache squashfs-root/resources/profiles/
+          appimagetool=$(find build -name "appimagetool.AppImage" | head -1)
+          ARCH=$(uname -m) "$appimagetool" --appimage-extract-and-run squashfs-root "$appimage"
+          rm -rf squashfs-root
+
       - name: Run external slicer regression tests
         if: runner.os == 'Linux' && inputs.arch != 'aarch64'
         timeout-minutes: 20

build_linux.sh

@@ -567,6 +567,8 @@ if [[ -n "${BUILD_ORCA}" ]] || [[ -n "${BUILD_TESTS}" ]] ; then
 	print_and_run cmake --build $BUILD_DIR --config "${BUILD_CONFIG}" --target OrcaSlicer
 	echo "Building OrcaSlicer_profile_validator .."
 	print_and_run cmake --build $BUILD_DIR --config "${BUILD_CONFIG}" --target OrcaSlicer_profile_validator
+	echo "Building generate_system_cache ..."
+	print_and_run cmake --build $BUILD_DIR --config "${BUILD_CONFIG}" --target generate_system_cache
 	./scripts/run_gettext.sh
     fi
     if [[ -n "${BUILD_TESTS}" ]] ; then

gen_cache.bat

@@ -0,0 +1,45 @@
+@echo off
+setlocal
+
+:: Usage: gen_cache.bat [Release|Debug|RelWithDebInfo]
+:: Generates per-vendor .cache files into resources/profiles/
+:: using generate_system_cache.exe from the local build tree.
+
+set BUILD_CONFIG=%~1
+if "%BUILD_CONFIG%"=="" set BUILD_CONFIG=Release
+
+set REPO=%~dp0
+set BUILD_DIR=%REPO%build
+set EXE=%BUILD_DIR%\src\dev-utils\%BUILD_CONFIG%\generate_system_cache.exe
+set PROFILES=%REPO%resources\profiles
+
+if not exist "%EXE%" (
+    echo ERROR: %EXE% not found.
+    echo Build the project first with ORCA_TOOLS=ON, config %BUILD_CONFIG%.
+    exit /b 1
+)
+
+if not exist "%PROFILES%" (
+    echo ERROR: profiles dir not found: %PROFILES%
+    exit /b 1
+)
+
+:: DLLs live in the main Release output, not next to the tool exe
+set PATH=%BUILD_DIR%\src\%BUILD_CONFIG%;%PATH%
+
+echo Generating system presets cache...
+echo   Tool   : %EXE%
+echo   Profiles: %PROFILES%
+echo.
+
+"%EXE%" --path "%PROFILES%" --log_level 2
+if %ERRORLEVEL% neq 0 (
+    echo.
+    echo ERROR: generate_system_cache failed ^(exit %ERRORLEVEL%^).
+    exit /b %ERRORLEVEL%
+)
+
+echo.
+echo Done. Cache files written to: %PROFILES%
+dir /b "%PROFILES%\*.cache" 2>nul
+endlocal

remove_cache.bat

@@ -0,0 +1,51 @@
+@echo off
+setlocal
+
+:: Removes all OrcaSlicer cache files so the next launch rebuilds from scratch.
+::
+:: Clears:
+::   resources/profiles/*.cache       bundled per-vendor binary caches
+::   %APPDATA%\OrcaSlicer\system\*.cache  user per-vendor binary caches
+::   %APPDATA%\OrcaSlicer\guide_profile_cache.json  guide JSON cache
+
+set REPO=%~dp0
+set PROFILES=%REPO%resources\profiles
+set USER_SYSTEM=%APPDATA%\OrcaSlicer\system
+set GUIDE_CACHE=%APPDATA%\OrcaSlicer\guide_profile_cache.json
+
+echo Removing OrcaSlicer cache files...
+echo.
+
+:: Bundled caches
+set FOUND=0
+for %%F in ("%PROFILES%\*.cache") do (
+    del "%%F"
+    echo   Deleted: %%~nxF  ^(bundled^)
+    set FOUND=1
+)
+if "%FOUND%"=="0" echo   No bundled .cache files found in resources\profiles\
+
+echo.
+
+:: User per-vendor caches
+set FOUND=0
+for %%F in ("%USER_SYSTEM%\*.cache") do (
+    del "%%F"
+    echo   Deleted: %%~nxF  ^(user^)
+    set FOUND=1
+)
+if "%FOUND%"=="0" echo   No user .cache files found in %USER_SYSTEM%\
+
+echo.
+
+:: Guide JSON cache
+if exist "%GUIDE_CACHE%" (
+    del "%GUIDE_CACHE%"
+    echo   Deleted: guide_profile_cache.json
+) else (
+    echo   No guide_profile_cache.json found
+)
+
+echo.
+echo Done. Next launch will rebuild all caches from JSON.
+endlocal

src/CMakeLists.txt

@@ -111,6 +111,8 @@ if(ORCA_TOOLS)
     endif()
     target_link_libraries(OrcaSlicer_profile_validator libslic3r boost_headeronly libcurl OpenSSL::SSL OpenSSL::Crypto)
     target_compile_definitions(OrcaSlicer_profile_validator PRIVATE -DBOOST_ALL_NO_LIB -DBOOST_USE_WINAPI_VERSION=0x602 -DBOOST_SYSTEM_USE_UTF8)
+
+
 endif()
 
 # Create a slic3r executable

src/OrcaSlicer.cpp

@@ -1317,7 +1317,13 @@ int CLI::run(int argc, char **argv)
         return CLI_INVALID_PARAMS;
     }
     BOOST_LOG_TRIVIAL(info) << "finished setup params, argc="<< argc << std::endl;
-    std::string temp_path = wxFileName::GetTempDir().utf8_str().data();
+    std::string temp_path = per_user_temp_dir(wxFileName::GetTempDir().utf8_str().data(), per_user_temp_id());
+    // Some consumers write into the temp root directly, so create it up front.
+    try {
+        boost::filesystem::create_directories(temp_path);
+    } catch (const std::exception &ex) {
+        BOOST_LOG_TRIVIAL(warning) << "failed to create per-user temp dir " << temp_path << ": " << ex.what();
+    }
     set_temporary_dir(temp_path);
 
     m_extra_config.apply(m_config, true);

src/dev-utils/CMakeLists.txt

@@ -20,6 +20,16 @@ if (SLIC3R_ENC_CHECK)
     )
 endif()
 
+if (ORCA_TOOLS)
+    set(_DEV_DEFS -DBOOST_ALL_NO_LIB -DBOOST_USE_WINAPI_VERSION=0x602 -DBOOST_SYSTEM_USE_UTF8)
+
+    # generate_system_cache: pre-generates per-vendor resources/profiles/<id>.cache files for CI bundling.
+    add_executable(generate_system_cache generate_system_cache.cpp)
+    target_link_libraries(generate_system_cache libslic3r boost_headeronly)
+    target_compile_definitions(generate_system_cache PRIVATE ${_DEV_DEFS})
+
+endif()
+
 # Function that adds source file encoding check to a target
 # using the above encoding-check binary
 

src/dev-utils/generate_system_cache.cpp

@@ -0,0 +1,88 @@
+#include "libslic3r/PresetBundle.hpp"
+#include "libslic3r/Preset.hpp"
+#include "libslic3r/Utils.hpp"
+
+#include <boost/filesystem.hpp>
+#include <boost/log/trivial.hpp>
+#include <boost/program_options.hpp>
+#include <boost/system/error_code.hpp>
+#include <iostream>
+
+using namespace Slic3r;
+namespace fs = boost::filesystem;
+namespace po = boost::program_options;
+
+int main(int argc, char* argv[])
+{
+    po::options_description desc("OrcaSlicer System Cache Generator\nUsage");
+    // clang-format off
+    desc.add_options()
+        ("help,h", "Show help")
+#ifdef __APPLE__
+        ("path,p", po::value<std::string>()->default_value("../../../../../../../resources/profiles"), "Path to profiles directory")
+#else
+        ("path,p", po::value<std::string>()->default_value("../../../resources/profiles"), "Path to profiles directory")
+#endif
+        ("log_level,l", po::value<int>()->default_value(2), "Log level (0=trace, 2=info, 4=error)");
+    // clang-format on
+
+    po::variables_map vm;
+    try {
+        po::store(po::parse_command_line(argc, argv, desc), vm);
+        if (vm.count("help")) { std::cout << desc << "\n"; return 0; }
+        po::notify(vm);
+    } catch (const po::error& e) {
+        std::cerr << "Error: " << e.what() << "\n" << desc << "\n";
+        return 1;
+    }
+
+    const std::string profiles_path = vm["path"].as<std::string>();
+    const int         log_level     = vm["log_level"].as<int>();
+
+    if (!fs::exists(profiles_path) || !fs::is_directory(profiles_path)) {
+        std::cerr << "Error: '" << profiles_path << "' is not a valid directory\n";
+        return 1;
+    }
+
+    set_logging_level(log_level);
+    set_data_dir(profiles_path);
+    set_resources_dir(fs::path(profiles_path).parent_path().make_preferred().string());
+
+    const fs::path user_dir = fs::path(data_dir()) / PRESET_USER_DIR;
+    if (!fs::exists(user_dir))
+        fs::create_directories(user_dir);
+
+    AppConfig app_config;
+    app_config.set("preset_folder", "default");
+
+    auto preset_bundle = std::make_unique<PresetBundle>();
+    preset_bundle->set_is_validation_mode(true);
+    preset_bundle->set_default_suppressed(true);
+
+    std::cout << "Loading system presets from: " << profiles_path << "\n";
+
+    try {
+        preset_bundle->load_presets(app_config, ForwardCompatibilitySubstitutionRule::EnableSilent);
+    } catch (const std::exception& ex) {
+        std::cerr << "Failed to load presets: " << ex.what() << "\n";
+        return 1;
+    }
+
+    const std::string output_path =
+        (fs::path(profiles_path) / "system_presets.cache").make_preferred().string();
+
+    std::cout << "Saving single-bundle cache to: " << output_path << "\n";
+
+    const auto stats = preset_bundle->save_system_presets_cache(profiles_path, output_path);
+
+    if (!stats.ok) {
+        std::cerr << "ERROR: verification failed\n";
+        return 1;
+    }
+
+    std::cout << "[ok] system_presets.cache\n"
+              << "  Total print presets:    " << stats.print_presets    << "\n"
+              << "  Total filament presets: " << stats.filament_presets << "\n"
+              << "  Total printer presets:  " << stats.printer_presets  << "\n";
+    return 0;
+}

src/libslic3r/Brim.cpp

@@ -61,7 +61,7 @@ static bool use_brim_efc_outline(const PrintObject &object)
         && object.config().raft_layers.value == 0;
 }
 
-//ORCA: Helper for snapping painted ears to the EFC outline.
+//ORCA: Helper for projecting painted ears to the EFC outline.
 static bool closest_point_on_expolygons(const ExPolygons &polygons, const Point &from, Point &closest_out)
 {
     double min_dist2 = std::numeric_limits<double>::max();
@@ -69,23 +69,22 @@ static bool closest_point_on_expolygons(const ExPolygons &polygons, const Point
 
     for (const ExPolygon &poly : polygons) {
         for (int i = 0; i < poly.num_contours(); ++i) {
-            const Point *candidate = poly.contour_or_hole(i).closest_point(from);
-            if (candidate == nullptr)
-                continue;
-            const int64_t dx = int64_t(candidate->x()) - int64_t(from.x());
-            const int64_t dy = int64_t(candidate->y()) - int64_t(from.y());
-            const double dist2 = double(dx * dx + dy * dy);
-            if (dist2 < min_dist2) {
-                min_dist2 = dist2;
-                closest_out = *candidate;
-                found = true;
+            const Lines lines = poly.contour_or_hole(i).lines();
+            for (const Line &line : lines) {
+                Point candidate;
+                const double dist2 = line.distance_to_squared(from, &candidate);
+                if (dist2 < min_dist2) {
+                    min_dist2 = dist2;
+                    closest_out = candidate;
+                    found = true;
+                }
             }
         }
     }
     return found;
 }
 
-//ORCA: Helper for matching painted ears to their original island before EFC snapping.
+//ORCA: Helper for matching painted ears to their original island before EFC projection.
 static int find_containing_expolygon_index(const ExPolygons &polygons, const Point &from)
 {
     for (size_t idx = 0; idx < polygons.size(); ++idx) {
@@ -95,7 +94,7 @@ static int find_containing_expolygon_index(const ExPolygons &polygons, const Poi
     return -1;
 }
 
-//ORCA: Keep painted ear snapping on the matching island when using EFC outline.
+//ORCA: Keep painted ear projection on the matching island when using EFC outline.
 static bool closest_point_on_matching_island(const ExPolygons &raw_outline, const ExPolygons &efc_outline, const Point &from, Point &closest_out)
 {
     const int island_idx = find_containing_expolygon_index(raw_outline, from);
@@ -106,6 +105,7 @@ static bool closest_point_on_matching_island(const ExPolygons &raw_outline, cons
     }
     return closest_point_on_expolygons(efc_outline, from, closest_out);
 }
+
 //ORCA: Use post-processed first-layer slices (including EFC) for brim outline.
 // Returns ExPolygons of the bottom layer after all first-layer modifiers
 // (including elephant foot compensation, if enabled) have been applied.
@@ -358,11 +358,12 @@ static ExPolygons make_brim_ears(const PrintObject* object, const double& flowWi
     if (brim_ear_points.size() <= 0) {
         return mouse_ears_ex;
     }
-    //ORCA: Painted ears can snap to the EFC-adjusted outline when enabled.
+    //ORCA: Painted ears follow the EFC-adjusted outline when enabled, while
+    // preserving their position along the selected outline segment.
     const bool use_efc_outline = use_brim_efc_outline(*object);
     const ExPolygons &raw_outline = object->layers().front()->lslices;
     //ORCA: Lazily computed EFC-adjusted bottom outline.
-    //Stored separately so we can avoid recomputation unless EFC snapping is used.
+    //Stored separately so we can avoid recomputation unless EFC projection is used.
     ExPolygons efc_outline_storage;
     const ExPolygons* efc_outline = nullptr;
 
@@ -390,17 +391,17 @@ static ExPolygons make_brim_ears(const PrintObject* object, const double& flowWi
         int32_t pt_x = scale_(pos.x());
         int32_t pt_y = scale_(pos.y());
 
-        //ORCA: Snap painted ears to the EFC-adjusted outline when enabled.
+        //ORCA: Project painted ears to the EFC-adjusted outline when enabled.
         if (use_efc_outline) {
             if (efc_outline == nullptr) {
-                //ORCA: Compute EFC-adjusted outline lazily for painted ear snapping.
+                //ORCA: Compute the EFC-adjusted outline lazily for painted ear projection.
                 efc_outline_storage = get_print_object_bottom_layer_expolygons(*object);
                 efc_outline = &efc_outline_storage;
             }
 
             if (!efc_outline->empty()) {
                 Point closest_point;
-                //ORCA: Snap within the matching island to avoid drifting to another island.
+                //ORCA: Project within the matching island to avoid drifting to another island.
                 if (closest_point_on_matching_island(
                         raw_outline,
                         *efc_outline,

src/libslic3r/Preset.cpp

@@ -147,6 +147,20 @@ Semver get_version_from_json(std::string file_path)
         return Semver();
         //throw ConfigurationError(format("Failed loading configuration file \"%1%\": %2%", file_path, err.what()));
     }
+    catch(...) {
+        return Semver();
+    }
+}
+
+std::string get_vendor_cache_key(const std::string& json_path)
+{
+    const Semver ver = get_version_from_json(json_path);
+    if (ver.valid())
+        return ver.to_string();
+    // No version field — use mtime as change fingerprint so edits invalidate the cache.
+    boost::system::error_code ec;
+    const std::time_t mtime = boost::filesystem::last_write_time(json_path, ec);
+    return ec ? std::string{} : ("mtime:" + std::to_string(mtime));
 }
 
 //BBS: add a function to load the key-values from xxx.json
@@ -742,6 +756,7 @@ void Preset::save(DynamicPrintConfig* parent_config)
         idx_file.replace_extension(".info");
         this->save_info(idx_file.string());
     }
+
 }
 
 void Preset::reload(Preset const &parent)

src/libslic3r/Preset.hpp

@@ -16,6 +16,14 @@
 #include "Semver.hpp"
 #include "ProjectTask.hpp"
 
+#include <cereal/archives/binary.hpp>
+#include <cereal/cereal.hpp>
+#include <cereal/types/map.hpp>
+#include <cereal/types/polymorphic.hpp>
+#include <cereal/types/set.hpp>
+#include <cereal/types/string.hpp>
+#include <cereal/types/vector.hpp>
+
 //BBS: change system directories
 #define PRESET_SYSTEM_DIR      "system"
 #define PRESET_USER_DIR        "user"
@@ -113,6 +121,10 @@ extern Semver get_version_from_json(std::string file_path);
 //BBS: add a function to load the key-values from xxx.json
 extern int get_values_from_json(std::string file_path, std::vector<std::string>& keys, std::map<std::string, std::string>& key_values);
 
+// Returns the cache key for a vendor JSON: the Semver string for versioned
+// vendors, or "mtime:<unix_timestamp>" for vendors without a version field.
+extern std::string get_vendor_cache_key(const std::string& json_path);
+
 extern ConfigFileType guess_config_file_type(const boost::property_tree::ptree &tree);
 
 extern void extend_default_config_length(DynamicPrintConfig& config, const bool set_nil_to_default, const DynamicPrintConfig& defaults);
@@ -130,6 +142,9 @@ public:
         PrinterVariant() {}
         PrinterVariant(const std::string &name) : name(name) {}
         std::string                 name;
+
+        template<class Archive>
+        void serialize(Archive& ar) { ar(name); }
     };
 
     struct PrinterModel {
@@ -160,6 +175,15 @@ public:
         }
 
         const PrinterVariant* variant(const std::string &name) const { return const_cast<PrinterModel*>(this)->variant(name); }
+
+        template<class Archive>
+        void serialize(Archive& ar)
+        {
+            ar(id, name, model_id, family, technology, variants, default_materials,
+               not_support_bed_types, bed_model, bed_texture, image_bed_type,
+               bottom_texture_end_name, use_double_extruder_default_texture,
+               bottom_texture_rect, middle_texture_rect, hotend_model);
+        }
     };
     std::vector<PrinterModel>          models;
 
@@ -171,6 +195,13 @@ public:
 
     bool 		valid() const { return ! name.empty() && ! id.empty() && config_version.valid(); }
 
+    template<class Archive>
+    void serialize(Archive& ar)
+    {
+        ar(id, name, config_version, config_update_url, changelog_url,
+           models, default_filaments, default_sla_materials);
+    }
+
     // Load VendorProfile from an ini file.
     // If `load_all` is false, only the header with basic info (name, version, URLs) is loaded.
     static VendorProfile from_ini(const boost::filesystem::path &path, bool load_all=true);
@@ -418,12 +449,31 @@ public:
 
     // BBS: move constructor to public
     Preset(Type type, const std::string &name, bool is_default = false) : type(type), is_default(is_default), name(name) {}
-
-protected:
+    // Default constructor is public so cereal can default-construct elements when
+    // deserializing std::vector<Preset> (std::allocator is not a cereal::access friend).
     Preset() = default;
 
+protected:
     friend class        PresetCollection;
     friend class        PresetBundle;
+    friend class        cereal::access;
+
+    // Serializes all value fields of Preset for the binary vendor cache.
+    // Raw pointers (vendor, loading_substitutions) are excluded — vendor is reconstructed
+    // by apply_vendor_cache() from the VendorProfile stored alongside the presets.
+    template<class Archive>
+    void serialize(Archive& ar)
+    {
+        ar(type, name, alias, file, version,
+           filament_id, setting_id, description,
+           renamed_from, is_system, is_visible,
+           is_default, is_external, is_dirty, is_compatible,
+           is_project_embedded, loaded,
+           m_from_orca_filament_lib, m_excluded_from,
+           bundle_id, user_id, base_id, sync_info,
+           updated_time, key_values, ini_str,
+           config);
+    }
 };
 
 bool is_compatible_with_print  (const PresetWithVendorProfile &preset, const PresetWithVendorProfile &active_print, const PresetWithVendorProfile &active_printer);

src/libslic3r/PresetBundle.cpp

@@ -1,7 +1,15 @@
 #include <cassert>
+#include <chrono>
 #include <ctime>
+#include <sstream>
 
 #include "PresetBundle.hpp"
+
+#include <boost/crc.hpp>
+#include <cereal/archives/binary.hpp>
+#include <cereal/types/map.hpp>
+#include <cereal/types/string.hpp>
+#include <cereal/types/vector.hpp>
 #include "PrintConfig.hpp"
 #include "libslic3r.h"
 #include "I18N.hpp"
@@ -520,6 +528,8 @@ PresetsConfigSubstitutions PresetBundle::load_presets(AppConfig &config, Forward
 
     //BBS: add config related logs
     BOOST_LOG_TRIVIAL(info) << __FUNCTION__ << boost::format(" enter, substitution_rule %1%, preferred printer_model_id %2%")%substitution_rule%preferred_selection.printer_model_id;
+    const auto startup_t0 = std::chrono::steady_clock::now();
+
     //BBS: change system config to json
     std::tie(substitutions, errors_cummulative) = this->load_system_presets_from_json(substitution_rule);
 
@@ -545,6 +555,12 @@ PresetsConfigSubstitutions PresetBundle::load_presets(AppConfig &config, Forward
 
     set_calibrate_printer("");
 
+    {
+        const auto total_ms = std::chrono::duration_cast<std::chrono::milliseconds>(
+            std::chrono::steady_clock::now() - startup_t0).count();
+        BOOST_LOG_TRIVIAL(info) << "PresetBundle: all presets loaded in " << total_ms << " ms";
+    }
+
     //BBS: add config related logs
     BOOST_LOG_TRIVIAL(info) << __FUNCTION__ << boost::format(" finished, returned substitutions %1%")%substitutions.size();
     return substitutions;
@@ -955,6 +971,8 @@ PresetsConfigSubstitutions PresetBundle::load_user_presets(std::string user, For
     bundles.m_bundles.clear();
     bundles.WriteUnlock();
 
+    const auto user_load_t0 = std::chrono::steady_clock::now();
+
     // Load bundle metadata from _local directory first
     fs::path local_dir(folder / PRESET_LOCAL_DIR);
     if (fs::exists(local_dir)) {
@@ -973,7 +991,6 @@ PresetsConfigSubstitutions PresetBundle::load_user_presets(std::string user, For
             metadata.filament_presets.clear();
             metadata.printer_presets.clear();
 
-            // Add the profiles
             this->prints.load_presets(bundle_dir, PRESET_PRINT_NAME, substitutions, substitution_rule, [&](Preset& preset) {
                 metadata.print_presets.push_back(preset.name);
             }, PresetOrigin(PresetOrigin::Kind::LocalBundle, metadata.id));
@@ -1010,7 +1027,6 @@ PresetsConfigSubstitutions PresetBundle::load_user_presets(std::string user, For
             metadata.printer_presets.clear();
             metadata.is_subscribed = true;
 
-            // Load presets from bundle (same logic as __local__)
             this->prints.load_presets(bundle_dir, PRESET_PRINT_NAME, substitutions, substitution_rule, [&](Preset& preset) {
                 metadata.print_presets.push_back(preset.name);
             }, PresetOrigin(PresetOrigin::Kind::SubscribedBundle, metadata.id));
@@ -1031,34 +1047,41 @@ PresetsConfigSubstitutions PresetBundle::load_user_presets(std::string user, For
         }
     }
 
-
     // BBS do not load sla_print
-    // BBS: change directoties by design
-    try {
-        std::string print_selected_preset_name = prints.get_selected_preset().name;
-        this->prints.load_presets(dir_user_presets, PRESET_PRINT_NAME, substitutions, substitution_rule);
-        prints.select_preset_by_name(print_selected_preset_name, false);
-    } catch (const std::runtime_error &err) {
-        errors_cummulative += err.what();
+    // BBS: change directories by design
+
+    {
+        const auto json_t0 = std::chrono::steady_clock::now();
+        try {
+            std::string sel = prints.get_selected_preset().name;
+            this->prints.load_presets(dir_user_presets, PRESET_PRINT_NAME, substitutions, substitution_rule);
+            prints.select_preset_by_name(sel, false);
+        } catch (const std::runtime_error& err) { errors_cummulative += err.what(); }
+        try {
+            std::string sel = filaments.get_selected_preset().name;
+            this->filaments.load_presets(dir_user_presets, PRESET_FILAMENT_NAME, substitutions, substitution_rule);
+            filaments.select_preset_by_name(sel, false);
+        } catch (const std::runtime_error& err) { errors_cummulative += err.what(); }
+        try {
+            std::string sel = printers.get_selected_preset().name;
+            this->printers.load_presets(dir_user_presets, PRESET_PRINTER_NAME, substitutions, substitution_rule);
+            printers.select_preset_by_name(sel, false);
+        } catch (const std::runtime_error& err) { errors_cummulative += err.what(); }
+        if (!errors_cummulative.empty()) throw Slic3r::RuntimeError(errors_cummulative);
+
+        const auto json_ms = std::chrono::duration_cast<std::chrono::milliseconds>(
+            std::chrono::steady_clock::now() - json_t0).count();
+        BOOST_LOG_TRIVIAL(info) << "PresetBundle: user presets loaded from JSON in " << json_ms << " ms";
     }
-    try {
-        std::string filament_selected_preset_name = filaments.get_selected_preset().name;
-        this->filaments.load_presets(dir_user_presets, PRESET_FILAMENT_NAME, substitutions, substitution_rule);
-        filaments.select_preset_by_name(filament_selected_preset_name, false);
-    } catch (const std::runtime_error &err) {
-        errors_cummulative += err.what();
+
+    {
+        const auto ms = std::chrono::duration_cast<std::chrono::milliseconds>(
+            std::chrono::steady_clock::now() - user_load_t0).count();
+        BOOST_LOG_TRIVIAL(info) << "PresetBundle: user + bundle presets loaded in " << ms << " ms";
     }
-    try {
-        std::string printer_selected_preset_name = printers.get_selected_preset().name;
-        this->printers.load_presets(dir_user_presets, PRESET_PRINTER_NAME, substitutions, substitution_rule);
-        printers.select_preset_by_name(printer_selected_preset_name, false);
-    } catch (const std::runtime_error &err) {
-        errors_cummulative += err.what();
-    }
-    if (!errors_cummulative.empty()) throw Slic3r::RuntimeError(errors_cummulative);
+
     this->update_multi_material_filament_presets();
     this->update_compatible(PresetSelectCompatibleType::Never);
-
     set_calibrate_printer("");
 
     return PresetsConfigSubstitutions();
@@ -2197,9 +2220,26 @@ std::pair<PresetsConfigSubstitutions, std::string> PresetBundle::load_system_pre
     if (validation_mode)
         dir = (boost::filesystem::path(data_dir())).make_preferred();
 
+    // Single-bundle cache: try user cache, then bundled cache, then JSON parse.
+    bool loaded_from_cache = false;
+    if (!validation_mode) {
+        const auto t0 = std::chrono::steady_clock::now();
+        const std::string expected_key = compute_system_presets_cache_key(dir.string());
+        if (try_load_system_presets_from_cache(expected_key)) {
+            update_system_maps();
+            const auto ms = std::chrono::duration_cast<std::chrono::milliseconds>(
+                std::chrono::steady_clock::now() - t0).count();
+            BOOST_LOG_TRIVIAL(info) << "PresetBundle: system presets loaded from single-bundle cache in " << ms << " ms";
+            return {PresetsConfigSubstitutions{}, ""};
+        }
+        loaded_from_cache = false; // cache miss — fall through to JSON parse
+    }
+
+    const auto json_load_t0 = std::chrono::steady_clock::now();
     PresetsConfigSubstitutions  substitutions;
     std::string                 errors_cummulative;
-    bool                        first = true;
+    std::set<std::string>       errored_vendors; // vendors whose JSON parse failed — skip their cache save
+    bool first = true;
     std::vector<std::string> vendor_names;
     // store all vendor names in vendor_names
     for (auto& dir_entry : boost::filesystem::directory_iterator(dir)) {
@@ -2237,6 +2277,7 @@ std::pair<PresetsConfigSubstitutions, std::string> PresetBundle::load_system_pre
                 throw err;
             errors_cummulative += err.what();
             errors_cummulative += "\n";
+            errored_vendors.insert(orca_lib_vendor);
         }
     }
 
@@ -2273,6 +2314,7 @@ std::pair<PresetsConfigSubstitutions, std::string> PresetBundle::load_system_pre
                 throw std::runtime_error(parallel_errors[i]);
             errors_cummulative += parallel_errors[i];
             errors_cummulative += "\n";
+            errored_vendors.insert(other_vendors[i]);
             continue;
         }
         if (!parallel_bundles[i])
@@ -2300,6 +2342,28 @@ std::pair<PresetsConfigSubstitutions, std::string> PresetBundle::load_system_pre
 	}
 
 	this->update_system_maps();
+
+    {
+        const auto json_ms = std::chrono::duration_cast<std::chrono::milliseconds>(
+            std::chrono::steady_clock::now() - json_load_t0).count();
+        BOOST_LOG_TRIVIAL(info) << "PresetBundle: system presets loaded from JSON in " << json_ms << " ms";
+    }
+
+    // Save single-bundle cache after successful JSON parse.
+    if (!validation_mode && errored_vendors.empty()) {
+        const auto save_t0 = std::chrono::steady_clock::now();
+        const auto stats = save_system_presets_cache(dir.string(), user_system_presets_cache_path());
+        const auto save_ms = std::chrono::duration_cast<std::chrono::milliseconds>(
+            std::chrono::steady_clock::now() - save_t0).count();
+        if (stats.ok)
+            BOOST_LOG_TRIVIAL(info) << "PresetBundle: single-bundle cache saved in " << save_ms << " ms"
+                                    << " (print=" << stats.print_presets
+                                    << " filament=" << stats.filament_presets
+                                    << " printer=" << stats.printer_presets << ")";
+        else
+            BOOST_LOG_TRIVIAL(warning) << "PresetBundle: single-bundle cache save failed";
+    }
+
     //BBS: add config related logs
     BOOST_LOG_TRIVIAL(debug) << __FUNCTION__ << boost::format(" finished, errors_cummulative %1%")%errors_cummulative;
     return std::make_pair(std::move(substitutions), errors_cummulative);
@@ -5789,4 +5853,305 @@ bool BundleMetadata::save_to_json(const std::string& path) const
         return false;
     }
 }
+// ---- System presets single-bundle cache implementation ------------------
+
+namespace {
+
+#pragma pack(push, 1)
+struct CacheFileHeader {
+    uint32_t magic;
+    uint32_t version;
+    uint64_t data_size;
+    uint32_t crc32;
+};
+#pragma pack(pop)
+static_assert(sizeof(CacheFileHeader) == 20, "CacheFileHeader must be 20 bytes");
+
+// Presets for one vendor, grouped so vendor pointers can be re-wired on load.
+struct VendorPresetGroup {
+    std::vector<Preset> prints, filaments, printers, sla_prints, sla_materials;
+    template<class Archive>
+    void serialize(Archive& ar) { ar(prints, filaments, printers, sla_prints, sla_materials); }
+};
+
+struct SystemPresetsCache {
+    static constexpr uint32_t CACHE_MAGIC   = 0x4F52435A; // "ORCZ"
+    static constexpr uint32_t CACHE_VERSION = 1;
+
+    uint32_t    cache_version        = CACHE_VERSION;
+    uint32_t    config_options_count = 0;
+    std::string bundle_key;
+
+    VendorMap                                 vendors;
+    std::map<std::string, VendorPresetGroup>  preset_groups;
+    std::map<std::string, DynamicPrintConfig> config_maps;
+    std::map<std::string, std::string>        filament_id_maps;
+
+    template<class Archive>
+    void serialize(Archive& ar)
+    {
+        ar(cache_version, config_options_count, bundle_key,
+           vendors, preset_groups, config_maps, filament_id_maps);
+    }
+
+    bool is_valid(const std::string& expected_key) const
+    {
+        return cache_version        == CACHE_VERSION
+            && config_options_count == static_cast<uint32_t>(print_config_def.options.size())
+            && bundle_key           == expected_key;
+    }
+};
+
+} // anonymous namespace
+
+// static
+std::string PresetBundle::bundled_system_presets_cache_path()
+{
+    return (boost::filesystem::path(resources_dir()) / "profiles" / "system_presets.cache")
+               .make_preferred().string();
+}
+
+// static
+std::string PresetBundle::user_system_presets_cache_path()
+{
+    return (boost::filesystem::path(data_dir()) / PRESET_SYSTEM_DIR / "system_presets.cache")
+               .make_preferred().string();
+}
+
+// static
+std::string PresetBundle::compute_system_presets_cache_key(const std::string& system_dir)
+{
+    // Sorted map so key is stable regardless of directory iteration order.
+    std::map<std::string, std::string> keys;
+    try {
+        for (const auto& e : boost::filesystem::directory_iterator(system_dir)) {
+            if (Slic3r::is_json_file(e.path().string()))
+                keys[e.path().stem().string()] = get_vendor_cache_key(e.path().string());
+        }
+    } catch (const std::exception& ex) {
+        BOOST_LOG_TRIVIAL(warning) << "SystemPresetsCache: cannot scan " << system_dir << ": " << ex.what();
+    }
+    std::string combined;
+    for (const auto& [name, key] : keys)
+        combined += name + ":" + key + ";";
+    return combined;
+}
+
+// static
+bool PresetBundle::read_cache_blob(const std::string& path, std::string& out_blob)
+{
+    try {
+        boost::nowide::ifstream ifs(path, std::ios::binary);
+        if (!ifs.is_open())
+            return false;
+        CacheFileHeader fhdr;
+        if (!ifs.read(reinterpret_cast<char*>(&fhdr), sizeof(fhdr)))
+            return false;
+        if (fhdr.magic != SystemPresetsCache::CACHE_MAGIC)
+            return false;
+        if (fhdr.data_size == 0 || fhdr.data_size > 512u * 1024u * 1024u)
+            return false;
+        out_blob.assign(fhdr.data_size, '\0');
+        if (!ifs.read(&out_blob[0], static_cast<std::streamsize>(fhdr.data_size)))
+            return false;
+        boost::crc_32_type crc;
+        crc.process_bytes(out_blob.data(), out_blob.size());
+        if (crc.checksum() != fhdr.crc32) {
+            BOOST_LOG_TRIVIAL(warning) << "SystemPresetsCache: CRC mismatch: " << path;
+            return false;
+        }
+        return true;
+    } catch (const std::exception& e) {
+        BOOST_LOG_TRIVIAL(warning) << "SystemPresetsCache: read failed (" << path << "): " << e.what();
+        return false;
+    }
+}
+
+// static
+void PresetBundle::write_cache_blob(const std::string& path, const std::string& blob)
+{
+    boost::crc_32_type crc;
+    crc.process_bytes(blob.data(), blob.size());
+    try {
+        boost::filesystem::create_directories(boost::filesystem::path(path).parent_path());
+        boost::nowide::ofstream ofs(path, std::ios::binary | std::ios::trunc);
+        if (!ofs.is_open()) {
+            BOOST_LOG_TRIVIAL(warning) << "SystemPresetsCache: cannot open for writing: " << path;
+            return;
+        }
+        CacheFileHeader fhdr;
+        fhdr.magic     = SystemPresetsCache::CACHE_MAGIC;
+        fhdr.version   = SystemPresetsCache::CACHE_VERSION;
+        fhdr.data_size = static_cast<uint64_t>(blob.size());
+        fhdr.crc32     = crc.checksum();
+        ofs.write(reinterpret_cast<const char*>(&fhdr), sizeof(fhdr));
+        ofs.write(blob.data(), static_cast<std::streamsize>(blob.size()));
+    } catch (const std::exception& e) {
+        BOOST_LOG_TRIVIAL(warning) << "SystemPresetsCache: write failed (" << path << "): " << e.what();
+    }
+}
+
+// Apply one VendorPresetGroup from a loaded cache into this PresetBundle's collections.
+static void apply_vendor_preset_group(VendorPresetGroup&       grp,
+                                       const VendorProfile*     vp,
+                                       PresetCollection&        prints_coll,
+                                       PresetCollection&        filaments_coll,
+                                       PrinterPresetCollection& printers_coll,
+                                       PresetCollection&        sla_prints_coll,
+                                       PresetCollection&        sla_materials_coll)
+{
+    auto apply = [&](std::vector<Preset>& cached, PresetCollection& coll, bool is_filaments) {
+        for (Preset& cp : cached) {
+            // Reserve a slot in the collection, then move the fully-deserialized
+            // preset into it so all serialized fields are transferred at once.
+            // Only vendor (a raw pointer, excluded from serialization) is patched after.
+            DynamicPrintConfig config = cp.config;
+            Preset& p = coll.load_preset(cp.file, cp.name, std::move(config), false, cp.version);
+            const std::string alias = cp.alias;
+            p        = std::move(cp);
+            p.vendor = vp;
+            if (is_filaments)
+                coll.set_printer_hold_alias(alias, p);
+        }
+    };
+    apply(grp.prints,        prints_coll,        false);
+    apply(grp.filaments,     filaments_coll,      true);
+    apply(grp.printers,      printers_coll,       false);
+    apply(grp.sla_prints,    sla_prints_coll,     false);
+    apply(grp.sla_materials, sla_materials_coll,  false);
+}
+
+bool PresetBundle::try_load_system_presets_from_cache(const std::string& expected_key)
+{
+    auto try_path = [&](const std::string& path) -> bool {
+        std::string blob;
+        if (!read_cache_blob(path, blob))
+            return false;
+        try {
+            std::istringstream iss(blob);
+            cereal::BinaryInputArchive ar(iss);
+            SystemPresetsCache cache;
+            ar(cache);
+            if (!cache.is_valid(expected_key))
+                return false;
+
+            this->reset(false);
+            vendors = std::move(cache.vendors);
+
+            for (auto& [vendor_id, grp] : cache.preset_groups) {
+                auto it = vendors.find(vendor_id);
+                if (it == vendors.end()) continue;
+                apply_vendor_preset_group(grp, &it->second,
+                                          prints, filaments, printers,
+                                          sla_prints, sla_materials);
+            }
+            m_config_maps      = std::move(cache.config_maps);
+            m_filament_id_maps = std::move(cache.filament_id_maps);
+            return true;
+        } catch (const std::exception& e) {
+            BOOST_LOG_TRIVIAL(warning) << "SystemPresetsCache: apply failed (" << path << "): " << e.what();
+            return false;
+        }
+    };
+
+    if (try_path(user_system_presets_cache_path()))
+        return true;
+    if (try_path(bundled_system_presets_cache_path())) {
+        // Promote bundled cache to user path so future loads skip JSON parse.
+        const std::string user_path = user_system_presets_cache_path();
+        const std::string bundled_path = bundled_system_presets_cache_path();
+        try {
+            boost::filesystem::create_directories(
+                boost::filesystem::path(user_path).parent_path());
+            boost::filesystem::copy_file(bundled_path, user_path,
+                boost::filesystem::copy_options::overwrite_existing);
+        } catch (const std::exception& e) {
+            BOOST_LOG_TRIVIAL(warning) << "SystemPresetsCache: promote failed: " << e.what();
+        }
+        return true;
+    }
+    return false;
+}
+
+PresetBundle::SaveCacheResult PresetBundle::save_system_presets_cache(
+    const std::string& profiles_dir, const std::string& output_path) const
+{
+    SystemPresetsCache cache;
+    cache.config_options_count = static_cast<uint32_t>(print_config_def.options.size());
+    cache.bundle_key           = compute_system_presets_cache_key(profiles_dir);
+    cache.vendors              = vendors;
+    cache.config_maps          = m_config_maps;
+    cache.filament_id_maps     = m_filament_id_maps;
+
+    auto fill = [&](const PresetCollection& coll,
+                    std::vector<Preset> VendorPresetGroup::*field) {
+        for (const Preset& p : coll())
+            if (p.is_system && p.vendor)
+                (cache.preset_groups[p.vendor->id].*field).push_back(p);
+    };
+    fill(prints,        &VendorPresetGroup::prints);
+    fill(filaments,     &VendorPresetGroup::filaments);
+    fill(sla_prints,    &VendorPresetGroup::sla_prints);
+    fill(sla_materials, &VendorPresetGroup::sla_materials);
+    // PrinterPresetCollection is a PresetCollection subclass; iterate directly.
+    for (const Preset& p : printers())
+        if (p.is_system && p.vendor)
+            cache.preset_groups[p.vendor->id].printers.push_back(p);
+
+    std::ostringstream oss;
+    { cereal::BinaryOutputArchive ar(oss); ar(cache); }
+    const std::string blob = oss.str();
+    write_cache_blob(output_path, blob);
+
+    SaveCacheResult result;
+    // Verify: read back and check validity.
+    if (std::string vblob; read_cache_blob(output_path, vblob)) {
+        try {
+            std::istringstream iss(vblob);
+            cereal::BinaryInputArchive ar(iss);
+            SystemPresetsCache v; ar(v);
+            result.ok = v.is_valid(cache.bundle_key);
+        } catch (...) {}
+    }
+    for (const auto& [vid, grp] : cache.preset_groups) {
+        result.print_presets    += grp.prints.size();
+        result.filament_presets += grp.filaments.size();
+        result.printer_presets  += grp.printers.size();
+    }
+    return result;
+}
+
+// static
+bool PresetBundle::load_system_presets_cache_for_guide(const std::string& cache_path,
+                                                        PresetBundle&      out_bundle)
+{
+    std::string blob;
+    if (!read_cache_blob(cache_path, blob))
+        return false;
+    try {
+        std::istringstream iss(blob);
+        cereal::BinaryInputArchive ar(iss);
+        SystemPresetsCache cache;
+        ar(cache);
+        if (cache.cache_version != SystemPresetsCache::CACHE_VERSION)
+            return false;
+
+        out_bundle.vendors = std::move(cache.vendors);
+        for (auto& [vendor_id, grp] : cache.preset_groups) {
+            auto it = out_bundle.vendors.find(vendor_id);
+            if (it == out_bundle.vendors.end()) continue;
+            apply_vendor_preset_group(grp, &it->second,
+                                      out_bundle.prints,
+                                      out_bundle.filaments,
+                                      out_bundle.printers,
+                                      out_bundle.sla_prints,
+                                      out_bundle.sla_materials);
+        }
+        return !out_bundle.vendors.empty();
+    } catch (const std::exception& e) {
+        BOOST_LOG_TRIVIAL(warning) << "SystemPresetsCache: guide load failed (" << cache_path << "): " << e.what();
+        return false;
+    }
+}
+
 } // namespace Slic3r

src/libslic3r/PresetBundle.hpp

@@ -13,6 +13,7 @@
 #include <boost/filesystem/path.hpp>
 #include <unordered_set>
 
+
 #define DEFAULT_USER_FOLDER_NAME "default"
 #define BUNDLE_STRUCTURE_JSON_NAME "bundle_structure.json"
 
@@ -151,6 +152,32 @@ struct PresetBundleMetadata
 class PresetBundle
 {
 public:
+    // ---- System presets single-bundle cache --------------------------------
+    // All vendor profiles + all system presets in one file.
+    //   Bundled (CI): resources/profiles/system_presets.cache
+    //   User runtime: data_dir/system/system_presets.cache
+
+    struct SaveCacheResult {
+        bool   ok               = false;
+        size_t print_presets    = 0;
+        size_t filament_presets = 0;
+        size_t printer_presets  = 0;
+    };
+
+    static std::string bundled_system_presets_cache_path();
+    static std::string user_system_presets_cache_path();
+
+    // Capture the currently-loaded PresetBundle and write a single-bundle cache
+    // to output_path. profiles_dir contains the vendor JSON files (for the key).
+    // Used by generate_system_cache and tests.
+    SaveCacheResult save_system_presets_cache(const std::string& profiles_dir,
+                                              const std::string& output_path) const;
+
+    // Load a single-bundle cache into out_bundle for the guide wizard.
+    // Returns false if the cache is missing, stale, or corrupt.
+    static bool load_system_presets_cache_for_guide(const std::string& cache_path,
+                                                    PresetBundle&      out_bundle);
+
     static DynamicPrintConfig construct_full_config(Preset                         &in_printer_preset,
                                                     Preset                         &in_print_preset,
                                                     const DynamicPrintConfig       &project_config,
@@ -493,6 +520,15 @@ public:
     bool check_preset_references() const;
 
 private:
+    // Compute combined invalidation key from all vendor JSON files in system_dir.
+    static std::string compute_system_presets_cache_key(const std::string& system_dir);
+    // Try user cache then bundled cache; apply all presets on hit.
+    bool try_load_system_presets_from_cache(const std::string& expected_key);
+    // Read raw cache blob: verify magic, size, CRC.
+    static bool read_cache_blob(const std::string& path, std::string& out_blob);
+    // Write a cache blob with the standard 20-byte file header.
+    static void write_cache_blob(const std::string& path, const std::string& blob);
+
     // Orca: validation only - flag any printer with two or more compatible
     // filament presets sharing one filament_id (ambiguous AMS subtype match).
     bool check_duplicate_filament_subtypes() const;

src/libslic3r/PrintConfig.hpp

@@ -2192,7 +2192,8 @@ namespace cereal {
             archive(serialization_key_ordinal);
             assert(serialization_key_ordinal > 0);
             auto it = Slic3r::print_config_def.by_serialization_key_ordinal.find(serialization_key_ordinal);
-            assert(it != Slic3r::print_config_def.by_serialization_key_ordinal.end());
+            if (it == Slic3r::print_config_def.by_serialization_key_ordinal.end())
+                throw std::runtime_error("VendorCache: unknown serialization_key_ordinal " + std::to_string(serialization_key_ordinal) + " - cache is stale");
             config.set_key_value(it->second->opt_key, it->second->load_option_from_archive(archive));
         }
     }

src/libslic3r/Semver.hpp

@@ -190,6 +190,16 @@ public:
 		os << self.to_string();
 		return os;
 	}
+
+	// cereal: round-trip through the standard 3-part string (major.minor.patch).
+	// to_string() uses a BBS 4-part format that semver_parse() cannot read back.
+	template<class Archive>
+	std::string save_minimal(const Archive&) const { return to_string_sf(); }
+	template<class Archive>
+	void load_minimal(const Archive&, const std::string& s) {
+		if (auto v = Semver::parse(s)) *this = std::move(*v);
+	}
+
 private:
 	semver_t ver;
 

src/libslic3r/Utils.hpp

@@ -300,6 +300,10 @@ std::string header_gcodeviewer_generated();
 
 // getpid platform wrapper
 extern unsigned get_current_pid();
+// Per-user id for isolating temp dirs; empty on Windows (its temp dir is already per-user).
+std::string per_user_temp_id();
+// Per-user temp root under `base`; an empty `user_id` returns `base` unchanged.
+std::string per_user_temp_dir(const std::string &base, const std::string &user_id);
 // BBS: backup & restore
 std::string get_process_name(int pid);
 

src/libslic3r/utils.cpp

@@ -1285,6 +1285,24 @@ unsigned get_current_pid()
 #endif
 }
 
+std::string per_user_temp_id()
+{
+#ifdef WIN32
+    return {};
+#else
+    return std::to_string(static_cast<unsigned long>(::getuid()));
+#endif
+}
+
+std::string per_user_temp_dir(const std::string &base, const std::string &user_id)
+{
+    if (user_id.empty())
+        return base;
+    // Keep the id at the top level so each user's dir sits directly in the world-writable temp
+    // root; a shared parent dir would be owned by whichever user created it first.
+    return base + "/orcaslicer_" + user_id;
+}
+
 // BBS: backup & restore
 std::string get_process_name(int pid)
 {

src/slic3r/GUI/WebGuideDialog.cpp

@@ -2,6 +2,7 @@
 #include "ConfigWizard.hpp"
 
 #include <boost/filesystem/operations.hpp>
+#include <boost/nowide/fstream.hpp>
 #include <boost/filesystem/path.hpp>
 #include <boost/iostreams/detail/select.hpp>
 #include <boost/log/trivial.hpp>
@@ -9,6 +10,7 @@
 #include "I18N.hpp"
 #include "libslic3r/AppConfig.hpp"
 #include "libslic3r/Config.hpp"
+#include "libslic3r/Preset.hpp"
 #include "libslic3r/PresetBundle.hpp"
 #include "slic3r/GUI/wxExtensions.hpp"
 #include "slic3r/GUI/GUI_App.hpp"
@@ -41,7 +43,32 @@ using namespace nlohmann;
 
 namespace Slic3r { namespace GUI {
 
-json m_ProfileJson;
+static std::string guide_json_cache_version_key(const boost::filesystem::path& rsrc_dir,
+                                                const boost::filesystem::path& user_dir)
+{
+    std::vector<std::string> parts;
+    auto collect = [&](const boost::filesystem::path& dir) {
+        boost::system::error_code ec;
+        if (!boost::filesystem::exists(dir, ec)) return;
+        for (const auto& e : boost::filesystem::directory_iterator(dir, ec)) {
+            if (e.path().extension().string() != ".json") continue;
+            const std::string k = get_vendor_cache_key(e.path().string());
+            if (!k.empty())
+                parts.push_back(e.path().filename().string() + "=" + k);
+        }
+    };
+    collect(rsrc_dir);
+    if (user_dir != rsrc_dir) collect(user_dir);
+    std::sort(parts.begin(), parts.end());
+    std::string result;
+    for (const auto& p : parts) { result += p; result += ';'; }
+    return result;
+}
+
+static boost::filesystem::path guide_json_cache_path()
+{
+    return boost::filesystem::path(data_dir()) / "guide_profile_cache.json";
+}
 
 static wxString update_custom_filaments()
 {
@@ -191,11 +218,10 @@ GuideFrame::GuideFrame(GUI_App *pGUI, long style)
 GuideFrame::~GuideFrame()
 {
     m_destroy = true;
-    if (m_load_task && m_load_task->joinable()) {
+    *m_cancel_token = true; // signal any queued CallAfter lambdas before join
+    if (m_load_task && m_load_task->joinable())
         m_load_task->join();
-        delete m_load_task;
-        m_load_task = nullptr;
-    }
+    m_load_task.reset();
     if (m_browser) {
         delete m_browser;
         m_browser = nullptr;
@@ -301,15 +327,85 @@ void GuideFrame::OnNavigationRequest(wxWebViewEvent &evt)
 /**
  * Callback invoked when a navigation request was accepted
  */
+void GuideFrame::init_guide_paths()
+{
+    m_ProfileJson             = json::parse("{}");
+    m_ProfileJson["model"]    = json::array();
+    m_ProfileJson["machine"]  = json::object();
+    m_ProfileJson["filament"] = json::object();
+    m_ProfileJson["process"]  = json::array();
+
+    vendor_dir      = (boost::filesystem::path(Slic3r::data_dir()) / PRESET_SYSTEM_DIR).make_preferred();
+    rsrc_vendor_dir = (boost::filesystem::path(resources_dir()) / "profiles").make_preferred();
+    orca_bundle_rsrc = true;
+
+    if (boost::filesystem::exists(vendor_dir)) {
+        for (const auto& entry : boost::filesystem::directory_iterator(vendor_dir)) {
+            if (!boost::filesystem::is_directory(entry) &&
+                boost::iequals(entry.path().extension().string(), ".json") &&
+                !boost::iequals(entry.path().stem().string(), PresetBundle::ORCA_FILAMENT_LIBRARY)) {
+                orca_bundle_rsrc = false;
+                break;
+            }
+        }
+    }
+
+    auto lib_json = boost::filesystem::path(PresetBundle::ORCA_FILAMENT_LIBRARY).replace_extension(".json");
+    m_OrcaFilaLibPath = boost::filesystem::exists(vendor_dir / lib_json)
+        ? (vendor_dir      / PresetBundle::ORCA_FILAMENT_LIBRARY).string()
+        : (rsrc_vendor_dir / PresetBundle::ORCA_FILAMENT_LIBRARY).string();
+}
+
+void GuideFrame::on_profile_loaded()
+{
+    // Must be called on the main thread.
+    SaveProfileData();
+    const std::string strAll = m_ProfileJson.dump(-1, ' ', false, json::error_handler_t::ignore);
+    BOOST_LOG_TRIVIAL(info) << __FUNCTION__ << ", finished, json contents:\n" << strAll;
+    json res;
+    res["command"]     = "userguide_profile_load_finish";
+    res["sequence_id"] = "10001";
+    RunScript(wxString::Format("HandleStudio(%s)", res.dump(-1, ' ', true)));
+}
+
 void GuideFrame::OnNavigationComplete(wxWebViewEvent &evt)
 {
     //wxLogMessage("%s", "Navigation complete; url='" + evt.GetURL() + "'");
     if (!bFirstComplete) {
-        m_load_task = new boost::thread(boost::bind(&GuideFrame::LoadProfileData, this));
-       // boost::thread LoadProfileThread(boost::bind(&GuideFrame::LoadProfileData, this));
-        //LoadProfileThread.detach();
-
         bFirstComplete = true;
+        try {
+            init_guide_paths();
+            if (BuildProfileDataFromPresetBundle()) {
+                // Persist so future opens that start before preset_bundle is ready
+                // can skip the slower loading paths.  Capture by value so the
+                // thread is safe even if the dialog closes before it finishes.
+                boost::thread([data   = m_ProfileJson,
+                               rsrc   = rsrc_vendor_dir,
+                               user   = vendor_dir] {
+                    try {
+                        json cache;
+                        cache["version"] = guide_json_cache_version_key(rsrc, user);
+                        if (cache["version"].get<std::string>().empty()) return;
+                        json base = data;
+                        for (auto& entry : base["model"]) entry["nozzle_selected"] = "";
+                        cache["data"] = std::move(base);
+                        boost::nowide::ofstream ofs(guide_json_cache_path().string());
+                        ofs << cache.dump(-1, ' ', false, json::error_handler_t::ignore);
+                        BOOST_LOG_TRIVIAL(info) << "GuideFrame: guide JSON cache saved";
+                    } catch (const std::exception& e) {
+                        BOOST_LOG_TRIVIAL(warning) << "GuideFrame: failed to save guide JSON cache: " << e.what();
+                    }
+                }).detach();
+                if (!m_destroy)
+                    on_profile_loaded();
+            } else {
+                // Presets not yet in memory — delegate to background thread.
+                m_load_task = std::make_unique<boost::thread>(boost::bind(&GuideFrame::LoadProfileData, this));
+            }
+        } catch (const std::exception& e) {
+            BOOST_LOG_TRIVIAL(error) << __FUNCTION__ << ", init error: " << e.what();
+            m_load_task = std::make_unique<boost::thread>(boost::bind(&GuideFrame::LoadProfileData, this));
+        }
     }
 
     m_browser->Show();
@@ -1127,99 +1223,355 @@ int GuideFrame::GetFilamentInfo( std::string VendorDirectory, json & pFilaList,
     return status;
 }
 
-int GuideFrame::LoadProfileData()
+bool GuideFrame::TryLoadGuideJsonCache()
+{
+    const auto path = guide_json_cache_path();
+    boost::system::error_code ec;
+    if (!boost::filesystem::exists(path, ec)) return false;
+    try {
+        boost::nowide::ifstream ifs(path.string());
+        json cache;
+        ifs >> cache;
+        if (!cache.contains("version") || !cache.contains("data")) return false;
+        const std::string expected = guide_json_cache_version_key(rsrc_vendor_dir, vendor_dir);
+        if (expected.empty() || cache["version"].get<std::string>() != expected) return false;
+        m_ProfileJson = cache["data"];
+        if (m_ProfileJson["machine"].empty()) return false;
+        BOOST_LOG_TRIVIAL(info) << "GuideFrame: loaded profile data from guide JSON cache ("
+                                << m_ProfileJson["model"].size()    << " models, "
+                                << m_ProfileJson["machine"].size()  << " machines, "
+                                << m_ProfileJson["filament"].size() << " filaments)";
+        return true;
+    } catch (const std::exception& e) {
+        BOOST_LOG_TRIVIAL(warning) << "GuideFrame: guide JSON cache load failed: " << e.what();
+        return false;
+    }
+}
+
+void GuideFrame::SaveGuideJsonCache()
 {
     try {
-        m_ProfileJson             = json::parse("{}");
+        json cache;
+        cache["version"] = guide_json_cache_version_key(rsrc_vendor_dir, vendor_dir);
+        if (cache["version"].get<std::string>().empty()) return;
+        json base = m_ProfileJson;
+        // Strip user-specific state — SaveProfileData() re-applies it from AppConfig.
+        for (auto& entry : base["model"])
+            entry["nozzle_selected"] = "";
+        cache["data"] = std::move(base);
+        boost::nowide::ofstream ofs(guide_json_cache_path().string());
+        ofs << cache.dump(-1, ' ', false, json::error_handler_t::ignore);
+        BOOST_LOG_TRIVIAL(info) << "GuideFrame: guide JSON cache saved";
+    } catch (const std::exception& e) {
+        BOOST_LOG_TRIVIAL(warning) << "GuideFrame: failed to save guide JSON cache: " << e.what();
+    }
+}
+
+bool GuideFrame::BuildProfileDataFromPresetBundle()
+{
+    PresetBundle* pb = wxGetApp().preset_bundle;
+    if (!pb || pb->vendors.empty())
+        return false;
+
+    try {
+        // Models from vendor profiles
+        for (const auto& [vendor_id, vp] : pb->vendors) {
+            for (const auto& model : vp.models) {
+                std::string nozzle_str;
+                for (const auto& v : model.variants) {
+                    if (!nozzle_str.empty()) nozzle_str += ";";
+                    nozzle_str += v.name;
+                }
+                std::string materials_str;
+                for (const auto& m : model.default_materials) {
+                    if (!materials_str.empty()) materials_str += ";";
+                    materials_str += m;
+                }
+                boost::filesystem::path cover_path =
+                    (boost::filesystem::path(resources_dir()) / "profiles" / vendor_id / (model.id + "_cover.png"))
+                        .make_preferred();
+                if (!boost::filesystem::exists(cover_path))
+                    cover_path =
+                        (boost::filesystem::path(resources_dir()) / "web/image/printer" / (model.id + "_cover.png"))
+                            .make_preferred();
+
+                json entry;
+                entry["model"]           = model.id;
+                entry["name"]            = model.name;
+                entry["vendor"]          = vendor_id;
+                entry["nozzle_diameter"] = nozzle_str;
+                entry["materials"]       = materials_str;
+                entry["cover"]           = cover_path.string();
+                entry["nozzle_selected"] = "";
+                entry["sub_path"]        = "";
+                m_ProfileJson["model"].push_back(entry);
+            }
+        }
+
+        // Machine map: preset name -> {model, nozzle variant}
+        for (const Preset& p : pb->printers()) {
+            if (!p.is_system) continue;
+            const auto* printer_model   = p.config.option<ConfigOptionString>("printer_model");
+            const auto* printer_variant = p.config.option<ConfigOptionString>("printer_variant");
+            if (!printer_model || printer_model->value.empty() || !printer_variant) continue;
+
+            json mach;
+            mach["model"]  = printer_model->value;
+            mach["nozzle"] = printer_variant->value;
+            m_ProfileJson["machine"][p.name] = mach;
+        }
+
+        // Filament map from system filament presets (vendor/type already resolved in config)
+        for (const Preset& p : pb->filaments()) {
+            if (!p.is_system) continue;
+            const auto* fila_vendor     = p.config.option<ConfigOptionStrings>("filament_vendor");
+            const auto* fila_type       = p.config.option<ConfigOptionStrings>("filament_type");
+            const auto* compat_printers = p.config.option<ConfigOptionStrings>("compatible_printers");
+
+            std::string vendor = (fila_vendor && !fila_vendor->values.empty()) ? fila_vendor->values[0] : "";
+            std::string type   = (fila_type   && !fila_type->values.empty())   ? fila_type->values[0]   : "";
+
+            std::string model_list;
+            if (compat_printers) {
+                for (const std::string& pname : compat_printers->values) {
+                    if (m_ProfileJson["machine"].contains(pname)) {
+                        std::string m = m_ProfileJson["machine"][pname]["model"];
+                        std::string n = m_ProfileJson["machine"][pname]["nozzle"];
+                        model_list += "[" + m + "++" + n + "]";
+                    }
+                }
+            }
+
+            json ff;
+            ff["name"]     = p.name;
+            ff["sub_path"] = p.file;
+            ff["vendor"]   = vendor;
+            ff["type"]     = type;
+            ff["models"]   = model_list;
+            ff["selected"] = 0;
+            m_ProfileJson["filament"][p.name] = ff;
+        }
+
+        // Process list from visible system print presets
+        for (const Preset& p : pb->prints()) {
+            if (!p.is_system || !p.is_visible) continue;
+            json entry;
+            entry["name"]     = p.name;
+            entry["sub_path"] = p.file;
+            m_ProfileJson["process"].push_back(entry);
+        }
+
+        // If rsrc_vendor_dir has vendor JSONs not covered by the current bundle, the
+        // bundle is incomplete (e.g. dev env where data_dir/system only has
+        // OrcaFilamentLibrary+Custom). Fall back so LoadProfileFamily reads both dirs.
+        try {
+            for (const auto& e : boost::filesystem::directory_iterator(rsrc_vendor_dir)) {
+                if (e.path().extension().string() != ".json") continue;
+                const std::string stem = e.path().stem().string();
+                if (pb->vendors.find(stem) == pb->vendors.end()) {
+                    BOOST_LOG_TRIVIAL(info) << "GuideFrame: vendor '" << stem
+                        << "' in resources but not in preset_bundle — falling back to JSON loading";
+                    m_ProfileJson["model"]    = json::array();
+                    m_ProfileJson["machine"]  = json::object();
+                    m_ProfileJson["filament"] = json::object();
+                    m_ProfileJson["process"]  = json::array();
+                    return false;
+                }
+            }
+        } catch (const std::exception&) {}
+
+        BOOST_LOG_TRIVIAL(info) << "GuideFrame: built profile data from preset_bundle ("
+                                << m_ProfileJson["model"].size()    << " models, "
+                                << m_ProfileJson["machine"].size()  << " machines, "
+                                << m_ProfileJson["filament"].size() << " filaments)";
+        return !m_ProfileJson["machine"].empty();
+    } catch (const std::exception& e) {
+        BOOST_LOG_TRIVIAL(warning) << "GuideFrame::BuildProfileDataFromPresetBundle failed: " << e.what()
+                                   << " — falling back to JSON loading";
         m_ProfileJson["model"]    = json::array();
         m_ProfileJson["machine"]  = json::object();
         m_ProfileJson["filament"] = json::object();
         m_ProfileJson["process"]  = json::array();
+        return false;
+    }
+}
 
-        vendor_dir      = (boost::filesystem::path(Slic3r::data_dir()) / PRESET_SYSTEM_DIR).make_preferred();
-        rsrc_vendor_dir = (boost::filesystem::path(resources_dir()) / "profiles").make_preferred();
+// Builds guide profile JSON from the per-vendor bundled caches
+// (resources/profiles/system_presets.cache, generated by CI).
+// This avoids the 90-second LoadProfileFamily fallback on first launch.
+bool GuideFrame::BuildProfileDataFromBundledCache()
+{
+    const std::string cache_path = PresetBundle::bundled_system_presets_cache_path();
+    if (!boost::filesystem::exists(cache_path))
+        return false;
 
-        // Orca: add custom as default
-        // Orca: add json logic for vendor bundle
-        orca_bundle_rsrc = true;
+    try {
+        PresetBundle bundle;
+        if (!PresetBundle::load_system_presets_cache_for_guide(cache_path, bundle))
+            return false;
 
-        // search if there exists a .json file in vendor_dir folder, if exists, set orca_bundle_rsrc to false
-        for (const auto& entry : boost::filesystem::directory_iterator(vendor_dir)) {
-            if (!boost::filesystem::is_directory(entry) && boost::iequals(entry.path().extension().string(), ".json") && !boost::iequals(entry.path().stem().string(), PresetBundle::ORCA_FILAMENT_LIBRARY)) {
-                orca_bundle_rsrc = false;
-                break;
+        for (const auto& [vendor_id, vp] : bundle.vendors) {
+            for (const auto& cm : vp.models) {
+                std::string nozzle_str;
+                for (const auto& v : cm.variants) {
+                    if (!nozzle_str.empty()) nozzle_str += ";";
+                    nozzle_str += v.name;
+                }
+                std::string materials_str;
+                for (const auto& m : cm.default_materials) {
+                    if (!materials_str.empty()) materials_str += ";";
+                    materials_str += m;
+                }
+                boost::filesystem::path cover_path =
+                    (boost::filesystem::path(resources_dir()) / "profiles" / vp.id / (cm.id + "_cover.png"))
+                        .make_preferred();
+                if (!boost::filesystem::exists(cover_path))
+                    cover_path =
+                        (boost::filesystem::path(resources_dir()) / "web/image/printer" / (cm.id + "_cover.png"))
+                            .make_preferred();
+
+                json entry;
+                entry["model"]           = cm.id;
+                entry["name"]            = cm.name;
+                entry["vendor"]          = vp.id;
+                entry["nozzle_diameter"] = nozzle_str;
+                entry["materials"]       = materials_str;
+                entry["cover"]           = cover_path.string();
+                entry["nozzle_selected"] = "";
+                entry["sub_path"]        = "";
+                m_ProfileJson["model"].push_back(entry);
             }
         }
 
-        // load the default filament library first
-        std::set<std::string> loaded_vendors;
-        auto filament_library_name = boost::filesystem::path(PresetBundle::ORCA_FILAMENT_LIBRARY).replace_extension(".json");
-        if (boost::filesystem::exists(vendor_dir / filament_library_name)) {
-            m_OrcaFilaLibPath = (vendor_dir / PresetBundle::ORCA_FILAMENT_LIBRARY).string();
-            LoadProfileFamily(PresetBundle::ORCA_FILAMENT_LIBRARY, (vendor_dir / filament_library_name).string());
-        } else {
-            m_OrcaFilaLibPath = (rsrc_vendor_dir / PresetBundle::ORCA_FILAMENT_LIBRARY).string();
-            LoadProfileFamily(PresetBundle::ORCA_FILAMENT_LIBRARY, (rsrc_vendor_dir / filament_library_name).string());
-        }
-        loaded_vendors.insert(PresetBundle::ORCA_FILAMENT_LIBRARY);
+        for (const Preset& cp : bundle.printers()) {
+            if (!cp.is_system || !cp.vendor) continue;
+            const auto* pm = cp.config.option<ConfigOptionString>("printer_model");
+            const auto* pv = cp.config.option<ConfigOptionString>("printer_variant");
+            if (!pm || pm->value.empty() || !pv) continue;
 
-        //load custom bundle from user data path
-        boost::filesystem::directory_iterator endIter;
-        for (boost::filesystem::directory_iterator iter(vendor_dir); iter != endIter; iter++) {
-            if (!boost::filesystem::is_directory(*iter)) {
-                wxString strVendor = from_u8(iter->path().string()).BeforeLast('.');
-                strVendor          = strVendor.AfterLast('\\');
-                strVendor          = strVendor.AfterLast('/');
-
-                wxString strExtension = from_u8(iter->path().string()).AfterLast('.').Lower();
-                if(strExtension.CmpNoCase("json") != 0 || loaded_vendors.find(w2s(strVendor)) != loaded_vendors.end())
-                    continue;
-
-                LoadProfileFamily(w2s(strVendor), iter->path().string());
-                loaded_vendors.insert(w2s(strVendor));
-            }
-            if (m_destroy)
-                return 0;
+            json mach;
+            mach["model"]  = pm->value;
+            mach["nozzle"] = pv->value;
+            m_ProfileJson["machine"][cp.name] = mach;
         }
 
-        boost::filesystem::directory_iterator others_endIter;
-        for (boost::filesystem::directory_iterator iter(rsrc_vendor_dir); iter != others_endIter; iter++) {
-            if (!boost::filesystem::is_directory(*iter)) {
-                wxString strVendor = from_u8(iter->path().string()).BeforeLast('.');
-                strVendor          = strVendor.AfterLast('\\');
-                strVendor          = strVendor.AfterLast('/');
-                wxString strExtension = from_u8(iter->path().string()).AfterLast('.').Lower();
-                if (strExtension.CmpNoCase("json") != 0 || loaded_vendors.find(w2s(strVendor)) != loaded_vendors.end())
-                    continue;
+        for (const Preset& cp : bundle.filaments()) {
+            if (!cp.is_system || !cp.vendor) continue;
+            const auto* fv = cp.config.option<ConfigOptionStrings>("filament_vendor");
+            const auto* ft = cp.config.option<ConfigOptionStrings>("filament_type");
+            const auto* compat = cp.config.option<ConfigOptionStrings>("compatible_printers");
 
-                LoadProfileFamily(w2s(strVendor), iter->path().string());
-                loaded_vendors.insert(w2s(strVendor));
+            std::string vendor = (fv && !fv->values.empty()) ? fv->values[0] : "";
+            std::string type   = (ft && !ft->values.empty()) ? ft->values[0]   : "";
+
+            std::string model_list;
+            if (compat) {
+                for (const std::string& pname : compat->values) {
+                    if (m_ProfileJson["machine"].contains(pname)) {
+                        std::string m = m_ProfileJson["machine"][pname]["model"];
+                        std::string n = m_ProfileJson["machine"][pname]["nozzle"];
+                        model_list += "[" + m + "++" + n + "]";
+                    }
+                }
             }
-            if (m_destroy)
-                return 0;
+
+            json ff;
+            ff["name"]     = cp.name;
+            ff["sub_path"] = cp.file;
+            ff["vendor"]   = vendor;
+            ff["type"]     = type;
+            ff["models"]   = model_list;
+            ff["selected"] = 0;
+            m_ProfileJson["filament"][cp.name] = ff;
         }
 
-        wxGetApp().CallAfter([this] {
-            if (!m_destroy) {
-                //sync to appconfig first to populate current selections
-                SaveProfileData();
+        for (const Preset& cp : bundle.prints()) {
+            if (!cp.is_system || !cp.vendor || !cp.is_visible) continue;
+            json entry;
+            entry["name"]     = cp.name;
+            entry["sub_path"] = cp.file;
+            m_ProfileJson["process"].push_back(entry);
+        }
 
-                //sync to web after selections are populated
-                std::string strAll = m_ProfileJson.dump(-1, ' ', false, json::error_handler_t::ignore);
+        BOOST_LOG_TRIVIAL(info) << "GuideFrame: built profile data from single-bundle cache ("
+            << m_ProfileJson["model"].size()    << " models, "
+            << m_ProfileJson["machine"].size()  << " machines, "
+            << m_ProfileJson["filament"].size() << " filaments)";
+        return !m_ProfileJson["machine"].empty();
+    } catch (const std::exception& ex) {
+        BOOST_LOG_TRIVIAL(warning) << "GuideFrame::BuildProfileDataFromBundledCache failed: " << ex.what();
+        m_ProfileJson["model"]    = json::array();
+        m_ProfileJson["machine"]  = json::object();
+        m_ProfileJson["filament"] = json::object();
+        m_ProfileJson["process"]  = json::array();
+        return false;
+    }
+}
 
-                BOOST_LOG_TRIVIAL(info) << __FUNCTION__ << ", finished, json contents: " << std::endl << strAll;
-                json m_Res           = json::object();
-                m_Res["command"]     = "userguide_profile_load_finish";
-                m_Res["sequence_id"] = "10001";
-                wxString strJS       = wxString::Format("HandleStudio(%s)", m_Res.dump(-1, ' ', true));
+int GuideFrame::LoadProfileData()
+{
+    // Background thread: the fast path in OnNavigationComplete failed (presets not yet loaded).
+    // Loading order (fastest to slowest):
+    //   1. Guide JSON cache (data_dir/guide_profile_cache.json, sub-second)
+    //   2. Bundled per-vendor binary caches (CI-generated, ~1-2s)
+    //   3. Read all vendor JSONs (~90s)
+    // After paths 2 or 3 the guide JSON cache is written so next open uses path 1.
+    try {
+        if (!TryLoadGuideJsonCache()) {
+            if (!BuildProfileDataFromBundledCache()) {
+                // Last resort — read all vendor JSONs (~90s)
+                std::set<std::string> loaded_vendors;
+                auto filament_library_name = boost::filesystem::path(PresetBundle::ORCA_FILAMENT_LIBRARY).replace_extension(".json");
+                if (boost::filesystem::exists(vendor_dir / filament_library_name))
+                    LoadProfileFamily(PresetBundle::ORCA_FILAMENT_LIBRARY, (vendor_dir / filament_library_name).string());
+                else
+                    LoadProfileFamily(PresetBundle::ORCA_FILAMENT_LIBRARY, (rsrc_vendor_dir / filament_library_name).string());
+                loaded_vendors.insert(PresetBundle::ORCA_FILAMENT_LIBRARY);
 
-                RunScript(strJS);
+                boost::filesystem::directory_iterator endIter;
+                for (boost::filesystem::directory_iterator iter(vendor_dir); iter != endIter; iter++) {
+                    if (!boost::filesystem::is_directory(*iter)) {
+                        wxString strVendor = from_u8(iter->path().string()).BeforeLast('.');
+                        strVendor          = strVendor.AfterLast('\\');
+                        strVendor          = strVendor.AfterLast('/');
+                        wxString strExtension = from_u8(iter->path().string()).AfterLast('.').Lower();
+                        if (strExtension.CmpNoCase("json") != 0 || loaded_vendors.find(w2s(strVendor)) != loaded_vendors.end())
+                            continue;
+                        LoadProfileFamily(w2s(strVendor), iter->path().string());
+                        loaded_vendors.insert(w2s(strVendor));
+                    }
+                    if (m_destroy) return 0;
+                }
+
+                boost::filesystem::directory_iterator others_endIter;
+                for (boost::filesystem::directory_iterator iter(rsrc_vendor_dir); iter != others_endIter; iter++) {
+                    if (!boost::filesystem::is_directory(*iter)) {
+                        wxString strVendor = from_u8(iter->path().string()).BeforeLast('.');
+                        strVendor          = strVendor.AfterLast('\\');
+                        strVendor          = strVendor.AfterLast('/');
+                        wxString strExtension = from_u8(iter->path().string()).AfterLast('.').Lower();
+                        if (strExtension.CmpNoCase("json") != 0 || loaded_vendors.find(w2s(strVendor)) != loaded_vendors.end())
+                            continue;
+                        LoadProfileFamily(w2s(strVendor), iter->path().string());
+                        loaded_vendors.insert(w2s(strVendor));
+                    }
+                    if (m_destroy) return 0;
+                }
             }
+            // Persist the result so subsequent opens skip both the bundled cache and
+            // the slow JSON loading path entirely.
+            SaveGuideJsonCache();
+        }
+
+        // Capture the cancel token by value (shared_ptr) so the lambda doesn't
+        // touch `this` if GuideFrame is destroyed before the event fires.
+        auto tok = m_cancel_token;
+        wxGetApp().CallAfter([this, tok] {
+            if (!*tok)
+                on_profile_loaded();
         });
-    } catch (std::exception& e) {
-        // wxLogMessage("GUIDE: load_profile_error  %s ", e.what());
-        //  wxMessageBox(e.what(), "", MB_OK);
-        BOOST_LOG_TRIVIAL(error) << __FUNCTION__ << ", error: " << e.what() << std::endl;
+    } catch (const std::exception& e) {
+        BOOST_LOG_TRIVIAL(error) << __FUNCTION__ << ", error: " << e.what();
     }
 
     filament_info_cache.clear();

src/slic3r/GUI/WebGuideDialog.hpp

@@ -30,10 +30,14 @@
 #include "libslic3r/PresetBundle.hpp"
 #include "slic3r/Utils/PresetUpdater.hpp"
 
+#include <atomic>
+#include <memory>
 #include <unordered_map>
 
 #include <nlohmann/json.hpp>
 
+#include <boost/thread.hpp>
+
 namespace Slic3r { namespace GUI {
 
 class GuideFrame : public DPIDialog
@@ -78,6 +82,12 @@ public:
     int LoadProfileData();
     int SaveProfileData();
     int LoadProfileFamily(std::string strVendor, std::string strFilePath);
+    void init_guide_paths();
+    void on_profile_loaded();
+    bool BuildProfileDataFromPresetBundle();
+    bool BuildProfileDataFromBundledCache();
+    bool TryLoadGuideJsonCache();
+    void SaveGuideJsonCache();
     int SaveProfile();
     int GetFilamentInfo( std::string VendorDirectory,json & pFilaList, std::string filepath, std::string &sVendor, std::string &sType);
 
@@ -112,8 +122,11 @@ private:
 
     //First Load
     bool bFirstComplete{false};
-    bool m_destroy{false};
-    boost::thread* m_load_task{ nullptr };
+    std::atomic<bool> m_destroy{false};
+    // Shared cancel token captured by CallAfter lambdas so they don't touch
+    // `this` after the destructor has run and the object is freed.
+    std::shared_ptr<std::atomic<bool>> m_cancel_token{std::make_shared<std::atomic<bool>>(false)};
+    std::unique_ptr<boost::thread> m_load_task;
 
     // User Config
     bool PrivacyUse;
@@ -123,6 +136,7 @@ private:
     bool InstallNetplugin;
     bool network_plugin_ready {false};
 
+    json m_ProfileJson;
     json m_OrcaFilaList;
     std::string m_OrcaFilaLibPath;
 

src/slic3r/GUI/wxExtensions.cpp

@@ -436,7 +436,9 @@ wxBitmap create_scaled_bitmap(  const std::string& bmp_name_in,
         return create_scaled_bitmap2(bmp_name_in, cache, win, px_cnt, grayscale, resize, array_new_color);
     }
     unsigned int width = 0;
-    unsigned int height = (unsigned int) (win->FromDIP(px_cnt) + 0.5f);
+    // win may be nullptr; use the static overload, which falls back to the primary display DPI.
+    // Calling win->FromDIP() on a null win is UB and lets the optimizer drop later null checks.
+    unsigned int height = (unsigned int) (wxWindow::FromDIP(px_cnt, win) + 0.5f);
 
     std::string bmp_name = bmp_name_in;
     boost::replace_last(bmp_name, ".png", "");
@@ -450,7 +452,7 @@ wxBitmap create_scaled_bitmap(  const std::string& bmp_name_in,
     // Try loading an SVG first, then PNG if SVG was not found:
     wxBitmap *bmp = cache.load_svg(bmp_name, width, height, grayscale, dark_mode, new_color, resize ? em_unit(win) * 0.1f : 0.f);
     if (bmp == nullptr) {
-        bmp = cache.load_png(bmp_name, width, height, grayscale, resize ? win->FromDIP(10) * 0.1f : 0.f);
+        bmp = cache.load_png(bmp_name, width, height, grayscale, resize ? wxWindow::FromDIP(10, win) * 0.1f : 0.f);
     }
 
     if (bmp == nullptr) {
@@ -471,7 +473,8 @@ wxBitmap create_scaled_bitmap2(const std::string& bmp_name_in, Slic3r::GUI::Bitm
     const vector<std::string>& array_new_color/* = vector<std::string>()*/) // color witch will used instead of orange
 {
     unsigned int width = 0;
-    unsigned int height = (unsigned int)(win->FromDIP(px_cnt) + 0.5f);
+    // win may be nullptr; see create_scaled_bitmap() above.
+    unsigned int height = (unsigned int)(wxWindow::FromDIP(px_cnt, win) + 0.5f);
 
     std::string bmp_name = bmp_name_in;
     boost::replace_last(bmp_name, ".png", "");

tests/libslic3r/CMakeLists.txt

@@ -14,6 +14,7 @@ add_executable(${_TEST_NAME}_tests
     test_config.cpp
     test_preset_bundle_loading.cpp
     test_preset_setting_id.cpp
+    test_vendor_cache.cpp
     test_elephant_foot_compensation.cpp
     test_geometry.cpp
     test_placeholder_parser.cpp
@@ -23,6 +24,7 @@ add_executable(${_TEST_NAME}_tests
     test_stl.cpp
     test_meshboolean.cpp
     test_marchingsquares.cpp
+    test_utils.cpp
     test_timeutils.cpp
     test_voronoi.cpp
     test_optimizers.cpp

tests/libslic3r/test_utils.cpp

@@ -0,0 +1,54 @@
+#include <catch2/catch_all.hpp>
+
+#include "libslic3r/Utils.hpp"
+
+#ifndef _WIN32
+#include <unistd.h>     // getuid
+#endif
+
+using namespace Slic3r;
+
+TEST_CASE("per_user_temp_dir composes a per-user temp root", "[utils]") {
+    const std::string base = "/tmp";
+
+    SECTION("an empty id returns base unchanged") {
+        REQUIRE(per_user_temp_dir(base, "") == base);
+    }
+    SECTION("a non-empty id is appended at the top level") {
+        REQUIRE(per_user_temp_dir(base, "1000") == base + "/orcaslicer_1000");
+    }
+    SECTION("distinct ids produce distinct roots") {
+        REQUIRE(per_user_temp_dir(base, "1000") != per_user_temp_dir(base, "1001"));
+    }
+}
+
+TEST_CASE("per_user_temp_id follows the platform contract", "[utils]") {
+    const std::string id = per_user_temp_id();
+
+    SECTION("stable across calls") {
+        REQUIRE(per_user_temp_id() == id);
+    }
+#ifdef _WIN32
+    SECTION("empty on Windows (its temp dir is already per-user)") {
+        REQUIRE(id.empty());
+    }
+#else
+    SECTION("the current uid on Linux/macOS") {
+        REQUIRE_FALSE(id.empty());
+        REQUIRE(id == std::to_string(static_cast<unsigned long>(::getuid())));
+    }
+#endif
+}
+
+// The end-to-end contract callers depend on: the temp root is left alone on
+// Windows and isolated per user on Linux/macOS.
+TEST_CASE("per-user temp root is unchanged on Windows, isolated elsewhere", "[utils]") {
+    const std::string base = "/tmp";
+    const std::string root = per_user_temp_dir(base, per_user_temp_id());
+#ifdef _WIN32
+    REQUIRE(root == base);
+#else
+    REQUIRE(root != base);
+    REQUIRE_THAT(root, Catch::Matchers::StartsWith(base + "/orcaslicer_"));
+#endif
+}

tests/libslic3r/test_vendor_cache.cpp

@@ -0,0 +1,458 @@
+#include <catch2/catch_all.hpp>
+
+#include <boost/filesystem.hpp>
+#include <boost/crc.hpp>
+#include <fstream>
+#include <set>
+
+#include "libslic3r/PresetBundle.hpp"
+#include "libslic3r/Preset.hpp"
+#include "libslic3r/PrintConfig.hpp"
+
+using namespace Slic3r;
+namespace fs = boost::filesystem;
+
+namespace {
+
+struct TempDir {
+    fs::path path;
+    TempDir() {
+        path = fs::temp_directory_path() / fs::unique_path("orca-cache-test-%%%%-%%%%");
+        fs::create_directories(path);
+    }
+    ~TempDir() { boost::system::error_code ec; fs::remove_all(path, ec); }
+};
+
+std::string write_vendor_json(const fs::path& dir, const std::string& vendor_id,
+                               const std::string& version = "1.0.0")
+{
+    const fs::path p = dir / (vendor_id + ".json");
+    std::ofstream f(p.string());
+    f << R"({"version":")" << version << R"(","name":")" << vendor_id << R"("})";
+    return p.string();
+}
+
+std::string write_versionless_vendor_json(const fs::path& dir, const std::string& vendor_id)
+{
+    const fs::path p = dir / (vendor_id + ".json");
+    std::ofstream f(p.string());
+    f << R"({"name":")" << vendor_id << R"("})";
+    return p.string();
+}
+
+void corrupt_blob_byte(const std::string& path)
+{
+    std::fstream f(path, std::ios::in | std::ios::out | std::ios::binary);
+    f.seekp(30);
+    char b = 0; f.read(&b, 1);
+    f.seekp(30);
+    b ^= 0xFF;
+    f.write(&b, 1);
+}
+
+// Patch cache_version (blob[0..3]) and recompute CRC so the file passes
+// the CRC check but fails the cache_version check in load_system_presets_cache_for_guide.
+void patch_cache_version(const std::string& path, uint32_t wrong_version)
+{
+    std::ifstream in(path, std::ios::binary);
+    std::vector<char> data(std::istreambuf_iterator<char>(in), {});
+    in.close();
+    if (data.size() < 24) return;
+    std::memcpy(&data[20], &wrong_version, 4);
+    boost::crc_32_type crc;
+    crc.process_bytes(&data[20], data.size() - 20);
+    const uint32_t new_crc = crc.checksum();
+    std::memcpy(&data[16], &new_crc, 4);
+    std::ofstream out(path, std::ios::binary | std::ios::trunc);
+    out.write(data.data(), static_cast<std::streamsize>(data.size()));
+}
+
+void add_vendor(PresetBundle& bundle, const std::string& vendor_id,
+                const std::string& name = "", Semver ver = Semver(1, 0, 0))
+{
+    VendorProfile vp(vendor_id);
+    vp.name           = name.empty() ? vendor_id + " Corp" : name;
+    vp.config_version = ver;
+    bundle.vendors.emplace(vendor_id, vp);
+}
+
+Preset& add_system_preset(PresetCollection& coll, const std::string& name,
+                            const VendorProfile* vp)
+{
+    Preset& p = coll.load_preset("", name, DynamicPrintConfig(coll.default_preset().config), false);
+    p.is_system = true;
+    p.vendor    = vp;
+    return p;
+}
+
+PresetBundle::SaveCacheResult save_one_vendor(PresetBundle& src,
+                                               const fs::path& profiles_dir,
+                                               const fs::path& cache_path)
+{
+    return src.save_system_presets_cache(profiles_dir.string(), cache_path.string());
+}
+
+// Helper: filter a collection by vendor_id.
+std::vector<const Preset*> presets_for(const PresetCollection& coll, const std::string& vendor_id)
+{
+    std::vector<const Preset*> out;
+    for (const Preset& p : coll())
+        if (p.is_system && p.vendor && p.vendor->id == vendor_id)
+            out.push_back(&p);
+    return out;
+}
+
+} // namespace
+
+TEST_CASE("SystemPresetsCache: save and load via guide API", "[VendorCache]")
+{
+    TempDir           tmp;
+    const std::string vid = "Acme";
+    write_vendor_json(tmp.path, vid);
+    const fs::path cache = tmp.path / "system_presets.cache";
+
+    PresetBundle src;
+    add_vendor(src, vid);
+    const VendorProfile* vp = &src.vendors.at(vid);
+
+    Preset& fp = add_system_preset(src.filaments, vid + " PLA @0.4", vp);
+    fp.alias       = "Acme PLA";
+    fp.filament_id = "GFL_acme_pla";
+    add_system_preset(src.printers, vid + " Printer 0.4", vp);
+
+    const auto stats = save_one_vendor(src, tmp.path, cache);
+    REQUIRE(stats.ok);
+    CHECK(stats.filament_presets == 1);
+    CHECK(stats.printer_presets  == 1);
+    CHECK(stats.print_presets    == 0);
+
+    PresetBundle out;
+    REQUIRE(PresetBundle::load_system_presets_cache_for_guide(cache.string(), out));
+    REQUIRE(out.vendors.count(vid) == 1);
+
+    auto fi = presets_for(out.filaments, vid);
+    auto pr = presets_for(out.printers,  vid);
+    REQUIRE(fi.size() == 1);
+    CHECK(fi[0]->name        == vid + " PLA @0.4");
+    CHECK(fi[0]->alias       == "Acme PLA");
+    CHECK(fi[0]->filament_id == "GFL_acme_pla");
+    REQUIRE(pr.size() == 1);
+    CHECK(pr[0]->name == vid + " Printer 0.4");
+}
+
+TEST_CASE("SystemPresetsCache: missing file returns false", "[VendorCache]")
+{
+    TempDir tmp;
+    PresetBundle out;
+    CHECK_FALSE(PresetBundle::load_system_presets_cache_for_guide(
+        (tmp.path / "nonexistent.cache").string(), out));
+}
+
+TEST_CASE("SystemPresetsCache: corrupt data rejected by CRC check", "[VendorCache]")
+{
+    TempDir           tmp;
+    const std::string vid = "Acme";
+    write_vendor_json(tmp.path, vid);
+    const fs::path cache = tmp.path / "system_presets.cache";
+
+    PresetBundle src;
+    add_vendor(src, vid);
+    add_system_preset(src.filaments, vid + " PLA", &src.vendors.at(vid));
+    save_one_vendor(src, tmp.path, cache);
+    corrupt_blob_byte(cache.string());
+
+    PresetBundle out;
+    CHECK_FALSE(PresetBundle::load_system_presets_cache_for_guide(cache.string(), out));
+}
+
+TEST_CASE("SystemPresetsCache: multiple vendors in one bundle are isolated", "[VendorCache]")
+{
+    TempDir tmp;
+    const std::string vid1 = "VendorA";
+    const std::string vid2 = "VendorB";
+    write_vendor_json(tmp.path, vid1);
+    write_vendor_json(tmp.path, vid2);
+    const fs::path cache = tmp.path / "system_presets.cache";
+
+    PresetBundle src;
+    for (const auto& vid : {vid1, vid2}) {
+        add_vendor(src, vid);
+        const VendorProfile* vp = &src.vendors.at(vid);
+        add_system_preset(src.filaments, vid + " PLA",     vp);
+        add_system_preset(src.printers,  vid + " Printer", vp);
+    }
+
+    REQUIRE(save_one_vendor(src, tmp.path, cache).ok);
+
+    PresetBundle out;
+    REQUIRE(PresetBundle::load_system_presets_cache_for_guide(cache.string(), out));
+    REQUIRE(out.vendors.count(vid1) == 1);
+    REQUIRE(out.vendors.count(vid2) == 1);
+
+    for (const auto& vid : {vid1, vid2}) {
+        auto fi = presets_for(out.filaments, vid);
+        auto pr = presets_for(out.printers,  vid);
+        REQUIRE(fi.size() == 1);
+        CHECK(fi[0]->name == vid + " PLA");
+        REQUIRE(pr.size() == 1);
+        CHECK(pr[0]->name == vid + " Printer");
+    }
+}
+
+TEST_CASE("SystemPresetsCache: vendor profile fields are preserved", "[VendorCache]")
+{
+    TempDir           tmp;
+    const std::string vid = "Acme";
+    write_vendor_json(tmp.path, vid, "2.5.1");
+    const fs::path cache = tmp.path / "system_presets.cache";
+
+    PresetBundle src;
+    VendorProfile vp(vid);
+    vp.name           = "Acme Corporation";
+    vp.config_version = Semver(2, 5, 1);
+    VendorProfile::PrinterModel model;
+    model.id   = "AcmePro";
+    model.name = "Acme Pro";
+    VendorProfile::PrinterVariant v0_4; v0_4.name = "0.4";
+    model.variants.push_back(v0_4);
+    vp.models.push_back(model);
+    src.vendors.emplace(vid, vp);
+    save_one_vendor(src, tmp.path, cache);
+
+    PresetBundle out;
+    REQUIRE(PresetBundle::load_system_presets_cache_for_guide(cache.string(), out));
+    REQUIRE(out.vendors.count(vid) == 1);
+    const VendorProfile& gvp = out.vendors.at(vid);
+    CHECK(gvp.id   == vid);
+    CHECK(gvp.name == "Acme Corporation");
+    REQUIRE(gvp.models.size() == 1);
+    CHECK(gvp.models[0].id   == "AcmePro");
+    CHECK(gvp.models[0].name == "Acme Pro");
+    REQUIRE(gvp.models[0].variants.size() == 1);
+    CHECK(gvp.models[0].variants[0].name  == "0.4");
+}
+
+TEST_CASE("SystemPresetsCache: config option values are preserved", "[VendorCache]")
+{
+    TempDir           tmp;
+    const std::string vid = "Acme";
+    write_vendor_json(tmp.path, vid);
+    const fs::path cache = tmp.path / "system_presets.cache";
+
+    PresetBundle src;
+    add_vendor(src, vid);
+    Preset& fp = add_system_preset(src.filaments, vid + " PETG @0.4", &src.vendors.at(vid));
+    fp.config.set_key_value("filament_type", new ConfigOptionStrings({"PETG"}));
+    save_one_vendor(src, tmp.path, cache);
+
+    PresetBundle out;
+    REQUIRE(PresetBundle::load_system_presets_cache_for_guide(cache.string(), out));
+
+    auto fi = presets_for(out.filaments, vid);
+    REQUIRE(fi.size() == 1);
+    const auto* ft = fi[0]->config.option<ConfigOptionStrings>("filament_type");
+    REQUIRE(ft != nullptr);
+    REQUIRE(ft->values.size() >= 1);
+    CHECK(ft->values[0] == "PETG");
+}
+
+TEST_CASE("SystemPresetsCache: multiple presets per collection round-trip", "[VendorCache]")
+{
+    TempDir           tmp;
+    const std::string vid = "Acme";
+    write_vendor_json(tmp.path, vid);
+    const fs::path cache = tmp.path / "system_presets.cache";
+
+    PresetBundle src;
+    add_vendor(src, vid);
+    const VendorProfile* vp = &src.vendors.at(vid);
+
+    const std::vector<std::string> fi_names = {vid + " PLA", vid + " PETG", vid + " ABS"};
+    const std::vector<std::string> pr_names = {vid + " Printer 0.4", vid + " Printer 0.6"};
+    for (const auto& n : fi_names) add_system_preset(src.filaments, n, vp);
+    for (const auto& n : pr_names) add_system_preset(src.printers,  n, vp);
+
+    const auto stats = save_one_vendor(src, tmp.path, cache);
+    REQUIRE(stats.ok);
+    CHECK(stats.filament_presets == 3);
+    CHECK(stats.printer_presets  == 2);
+
+    PresetBundle out;
+    REQUIRE(PresetBundle::load_system_presets_cache_for_guide(cache.string(), out));
+
+    auto fi = presets_for(out.filaments, vid);
+    auto pr = presets_for(out.printers,  vid);
+    REQUIRE(fi.size() == 3);
+    REQUIRE(pr.size() == 2);
+
+    std::set<std::string> fi_got, pr_got;
+    for (const auto* p : fi) fi_got.insert(p->name);
+    for (const auto* p : pr) pr_got.insert(p->name);
+    for (const auto& n : fi_names) CHECK(fi_got.count(n) == 1);
+    for (const auto& n : pr_names) CHECK(pr_got.count(n) == 1);
+}
+
+TEST_CASE("SystemPresetsCache: truncated file is rejected", "[VendorCache]")
+{
+    TempDir        tmp;
+    const fs::path cache = tmp.path / "truncated.cache";
+    {
+        std::ofstream f(cache.string(), std::ios::binary);
+        const char data[] = {0x4F, 0x52, 0x43};
+        f.write(data, sizeof(data));
+    }
+    PresetBundle out;
+    CHECK_FALSE(PresetBundle::load_system_presets_cache_for_guide(cache.string(), out));
+}
+
+TEST_CASE("SystemPresetsCache: wrong magic is rejected", "[VendorCache]")
+{
+    TempDir           tmp;
+    const std::string vid = "Acme";
+    write_vendor_json(tmp.path, vid);
+    const fs::path cache = tmp.path / "system_presets.cache";
+
+    PresetBundle src;
+    add_vendor(src, vid);
+    add_system_preset(src.filaments, vid + " PLA", &src.vendors.at(vid));
+    save_one_vendor(src, tmp.path, cache);
+
+    {
+        std::fstream f(cache.string(), std::ios::in | std::ios::out | std::ios::binary);
+        const uint32_t bad = 0xDEADBEEFu;
+        f.write(reinterpret_cast<const char*>(&bad), sizeof(bad));
+    }
+
+    PresetBundle out;
+    CHECK_FALSE(PresetBundle::load_system_presets_cache_for_guide(cache.string(), out));
+}
+
+TEST_CASE("SystemPresetsCache: vendor with no presets saves and loads cleanly", "[VendorCache]")
+{
+    TempDir           tmp;
+    const std::string vid = "Acme";
+    write_vendor_json(tmp.path, vid);
+    const fs::path cache = tmp.path / "system_presets.cache";
+
+    PresetBundle src;
+    VendorProfile vp(vid);
+    vp.name           = "Acme Corporation";
+    vp.config_version = Semver(1, 0, 0);
+    src.vendors.emplace(vid, vp);
+
+    const auto stats = save_one_vendor(src, tmp.path, cache);
+    REQUIRE(stats.ok);
+    CHECK(stats.print_presets    == 0);
+    CHECK(stats.filament_presets == 0);
+    CHECK(stats.printer_presets  == 0);
+
+    PresetBundle out;
+    REQUIRE(PresetBundle::load_system_presets_cache_for_guide(cache.string(), out));
+    REQUIRE(out.vendors.count(vid) == 1);
+    CHECK(out.vendors.at(vid).id   == vid);
+    CHECK(out.vendors.at(vid).name == "Acme Corporation");
+    CHECK(presets_for(out.filaments, vid).empty());
+    CHECK(presets_for(out.printers,  vid).empty());
+    CHECK(presets_for(out.prints,    vid).empty());
+}
+
+TEST_CASE("SystemPresetsCache: all Preset metadata fields are preserved", "[VendorCache]")
+{
+    TempDir           tmp;
+    const std::string vid = "Acme";
+    write_vendor_json(tmp.path, vid);
+    const fs::path cache = tmp.path / "system_presets.cache";
+
+    PresetBundle src;
+    add_vendor(src, vid);
+    Preset& fp     = add_system_preset(src.filaments, vid + " PLA @0.4", &src.vendors.at(vid));
+    fp.setting_id  = "sid-test-001";
+    fp.description = "A test filament preset";
+    fp.bundle_id   = "bundle-xyz";
+    fp.user_id     = "user-abc";
+    fp.base_id     = "base-123";
+    fp.sync_info   = "update";
+    fp.updated_time = 1700000000LL;
+    fp.key_values  = {{"color", "red"}, {"diameter", "1.75"}};
+    fp.ini_str     = "[filament]\nnozzle_temperature = 230\n";
+    save_one_vendor(src, tmp.path, cache);
+
+    PresetBundle out;
+    REQUIRE(PresetBundle::load_system_presets_cache_for_guide(cache.string(), out));
+
+    auto fi = presets_for(out.filaments, vid);
+    REQUIRE(fi.size() == 1);
+    CHECK(fi[0]->setting_id   == "sid-test-001");
+    CHECK(fi[0]->description  == "A test filament preset");
+    CHECK(fi[0]->bundle_id    == "bundle-xyz");
+    CHECK(fi[0]->user_id      == "user-abc");
+    CHECK(fi[0]->base_id      == "base-123");
+    CHECK(fi[0]->sync_info    == "update");
+    CHECK(fi[0]->updated_time == 1700000000LL);
+    REQUIRE(fi[0]->key_values.count("color") == 1);
+    CHECK(fi[0]->key_values.at("color")      == "red");
+    REQUIRE(fi[0]->key_values.count("diameter") == 1);
+    CHECK(fi[0]->key_values.at("diameter")   == "1.75");
+    CHECK(fi[0]->ini_str == "[filament]\nnozzle_temperature = 230\n");
+}
+
+TEST_CASE("SystemPresetsCache: wrong cache_version is rejected", "[VendorCache]")
+{
+    TempDir           tmp;
+    const std::string vid = "Acme";
+    write_vendor_json(tmp.path, vid);
+    const fs::path cache = tmp.path / "system_presets.cache";
+
+    PresetBundle src;
+    add_vendor(src, vid);
+    add_system_preset(src.filaments, vid + " PLA", &src.vendors.at(vid));
+    save_one_vendor(src, tmp.path, cache);
+    patch_cache_version(cache.string(), 0xFFFFFFFFu);
+
+    PresetBundle out;
+    CHECK_FALSE(PresetBundle::load_system_presets_cache_for_guide(cache.string(), out));
+}
+
+TEST_CASE("SystemPresetsCache: mid-blob truncation is rejected", "[VendorCache]")
+{
+    TempDir           tmp;
+    const std::string vid = "Acme";
+    write_vendor_json(tmp.path, vid);
+    const fs::path cache = tmp.path / "system_presets.cache";
+
+    PresetBundle src;
+    add_vendor(src, vid);
+    add_system_preset(src.filaments, vid + " PLA", &src.vendors.at(vid));
+    save_one_vendor(src, tmp.path, cache);
+
+    {
+        std::ifstream in(cache.string(), std::ios::binary);
+        std::vector<char> buf(30); // 20-byte header + 10 bytes of blob
+        in.read(buf.data(), 30);
+        in.close();
+        std::ofstream out(cache.string(), std::ios::binary | std::ios::trunc);
+        out.write(buf.data(), 30);
+    }
+
+    PresetBundle out;
+    CHECK_FALSE(PresetBundle::load_system_presets_cache_for_guide(cache.string(), out));
+}
+
+TEST_CASE("SystemPresetsCache: versionless vendor uses mtime key in bundle", "[VendorCache]")
+{
+    TempDir           tmp;
+    const std::string vid = "Acme";
+    write_versionless_vendor_json(tmp.path, vid);
+    const fs::path cache = tmp.path / "system_presets.cache";
+
+    PresetBundle src;
+    add_vendor(src, vid);
+    add_system_preset(src.filaments, vid + " PLA", &src.vendors.at(vid));
+    REQUIRE(save_one_vendor(src, tmp.path, cache).ok);
+
+    PresetBundle out;
+    REQUIRE(PresetBundle::load_system_presets_cache_for_guide(cache.string(), out));
+    auto fi = presets_for(out.filaments, vid);
+    REQUIRE(fi.size() == 1);
+    CHECK(fi[0]->name == vid + " PLA");
+}