diff --git a/app/vmalert/config/types.go b/app/vmalert/config/types.go
index 811d42dc15..b0f3d74f63 100644
--- a/app/vmalert/config/types.go
+++ b/app/vmalert/config/types.go
@@ -2,6 +2,7 @@ package config
 
 import (
 	"fmt"
+	"slices"
 	"strings"
 
 	"github.com/VictoriaMetrics/VictoriaLogs/lib/logstorage"
@@ -80,12 +81,8 @@ func (t *Type) ValidateExpr(expr string) error {
 		if err != nil {
 			return fmt.Errorf("cannot obtain labels from LogsQL expr: %q, err: %w", expr, err)
 		}
-		for i := range labels {
-			// VictoriaLogs inserts `_time` field as a label in result when query with `stats by (_time:step)`,
-			// making the result meaningless and may lead to cardinality issues.
-			if labels[i] == "_time" {
-				return fmt.Errorf("bad LogsQL expr: %q, err: cannot contain time buckets stats pipe `stats by (_time:step)`", expr)
-			}
+		if slices.Contains(labels, "_time") {
+			return fmt.Errorf("bad LogsQL expr: %q, err: cannot contain time buckets stats pipe `stats by (_time:step)`", expr)
 		}
 	default:
 		return fmt.Errorf("unknown datasource type=%q", t.Name)
diff --git a/app/vmselect/netstorage/netstorage.go b/app/vmselect/netstorage/netstorage.go
index 24b4fb018a..2ae25fc073 100644
--- a/app/vmselect/netstorage/netstorage.go
+++ b/app/vmselect/netstorage/netstorage.go
@@ -6,6 +6,7 @@ import (
 	"flag"
 	"fmt"
 	"math"
+	"slices"
 	"sort"
 	"sync"
 	"sync/atomic"
@@ -832,12 +833,7 @@ func GraphiteTags(qt *querytracer.Tracer, filter string, limit int, deadline sea
 }
 
 func hasString(a []string, s string) bool {
-	for _, x := range a {
-		if x == s {
-			return true
-		}
-	}
-	return false
+	return slices.Contains(a, s)
 }
 
 // LabelValues returns label values matching the given labelName and sq until the given deadline.
diff --git a/app/vmselect/prometheus/prometheus.go b/app/vmselect/prometheus/prometheus.go
index f4930dcf5f..2ead02bd3d 100644
--- a/app/vmselect/prometheus/prometheus.go
+++ b/app/vmselect/prometheus/prometheus.go
@@ -6,6 +6,7 @@ import (
 	"math"
 	"net/http"
 	"runtime"
+	"slices"
 	"strconv"
 	"strings"
 	"sync"
@@ -1004,14 +1005,7 @@ func removeEmptyValuesAndTimeseries(tss []netstorage.Result) []netstorage.Result
 	dst := tss[:0]
 	for i := range tss {
 		ts := &tss[i]
-		hasNaNs := false
-		for _, v := range ts.Values {
-			if math.IsNaN(v) {
-				hasNaNs = true
-				break
-			}
-		}
-		if !hasNaNs {
+		if !slices.ContainsFunc(ts.Values, math.IsNaN) {
 			// Fast path: nothing to remove.
 			if len(ts.Values) > 0 {
 				dst = append(dst, *ts)
diff --git a/app/vmselect/promql/eval.go b/app/vmselect/promql/eval.go
index 95a454419f..b36fd6dca1 100644
--- a/app/vmselect/promql/eval.go
+++ b/app/vmselect/promql/eval.go
@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"math"
 	"regexp"
+	"slices"
 	"sort"
 	"strings"
 	"sync"
@@ -1935,14 +1936,7 @@ func dropStaleNaNs(funcName string, values []float64, timestamps []int64) ([]flo
 		return values, timestamps
 	}
 	// Remove Prometheus staleness marks, so non-default rollup functions don't hit NaN values.
-	hasStaleSamples := false
-	for _, v := range values {
-		if decimal.IsStaleNaN(v) {
-			hasStaleSamples = true
-			break
-		}
-	}
-	if !hasStaleSamples {
+	if !slices.ContainsFunc(values, decimal.IsStaleNaN) {
 		// Fast path: values have no Prometheus staleness marks.
 		return values, timestamps
 	}
diff --git a/lib/flagutil/usage.go b/lib/flagutil/usage.go
index 3ddf1f77b8..705c7ff162 100644
--- a/lib/flagutil/usage.go
+++ b/lib/flagutil/usage.go
@@ -4,6 +4,7 @@ import (
 	"flag"
 	"fmt"
 	"os"
+	"slices"
 	"strings"
 )
 
@@ -19,12 +20,7 @@ func Usage(s string) {
 }
 
 func hasHelpFlag(args []string) bool {
-	for _, arg := range args {
-		if isHelpArg(arg) {
-			return true
-		}
-	}
-	return false
+	return slices.ContainsFunc(args, isHelpArg)
 }
 
 func isHelpArg(arg string) bool {
diff --git a/lib/promscrape/discovery/consul/watch.go b/lib/promscrape/discovery/consul/watch.go
index 5b951fe470..6547f6ed23 100644
--- a/lib/promscrape/discovery/consul/watch.go
+++ b/lib/promscrape/discovery/consul/watch.go
@@ -7,6 +7,7 @@ import (
 	"flag"
 	"fmt"
 	"net/url"
+	"slices"
 	"strings"
 	"sync"
 	"time"
@@ -327,14 +328,7 @@ func shouldCollectServiceByTags(filterTags, tags []string) bool {
 		return true
 	}
 	for _, filterTag := range filterTags {
-		hasTag := false
-		for _, tag := range tags {
-			if tag == filterTag {
-				hasTag = true
-				break
-			}
-		}
-		if !hasTag {
+		if !slices.Contains(tags, filterTag) {
 			return false
 		}
 	}
diff --git a/lib/promscrape/discovery/kubernetes/endpoints.go b/lib/promscrape/discovery/kubernetes/endpoints.go
index f3dd15a649..29b722f61d 100644
--- a/lib/promscrape/discovery/kubernetes/endpoints.go
+++ b/lib/promscrape/discovery/kubernetes/endpoints.go
@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
+	"slices"
 
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discoveryutil"
@@ -116,12 +117,7 @@ func (eps *Endpoints) getTargetLabels(gw *groupWatcher) []*promutil.Labels {
 
 	// Append labels for skipped ports on seen pods.
 	portSeen := func(port int, ports []int) bool {
-		for _, p := range ports {
-			if p == port {
-				return true
-			}
-		}
-		return false
+		return slices.Contains(ports, port)
 	}
 	appendPodMetadata := func(p *Pod, c *Container, seen []int, isInit bool) {
 		for _, cp := range c.Ports {
diff --git a/lib/promscrape/discovery/kubernetes/endpointslice.go b/lib/promscrape/discovery/kubernetes/endpointslice.go
index eb4fb42593..8673bc67e8 100644
--- a/lib/promscrape/discovery/kubernetes/endpointslice.go
+++ b/lib/promscrape/discovery/kubernetes/endpointslice.go
@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
+	"slices"
 	"strconv"
 
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discoveryutil"
@@ -66,12 +67,7 @@ func (eps *EndpointSlice) getTargetLabels(gw *groupWatcher) []*promutil.Labels {
 
 	// Append labels for skipped ports on seen pods.
 	portSeen := func(port int, ports []int) bool {
-		for _, p := range ports {
-			if p == port {
-				return true
-			}
-		}
-		return false
+		return slices.Contains(ports, port)
 	}
 	appendPodMetadata := func(p *Pod, c *Container, seen []int, isInit bool) {
 		for _, cp := range c.Ports {
diff --git a/lib/proxy/proxy.go b/lib/proxy/proxy.go
index 2126b56d94..04c79eb30a 100644
--- a/lib/proxy/proxy.go
+++ b/lib/proxy/proxy.go
@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"net/http"
 	"net/url"
+	"slices"
 
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promauth"
@@ -14,12 +15,7 @@ import (
 var validURLSchemes = []string{"http", "https", "socks5", "tls+socks5"}
 
 func isURLSchemeValid(scheme string) bool {
-	for _, vs := range validURLSchemes {
-		if scheme == vs {
-			return true
-		}
-	}
-	return false
+	return slices.Contains(validURLSchemes, scheme)
 }
 
 // URL implements YAML.Marshaler and yaml.Unmarshaler interfaces for url.URL.
diff --git a/lib/regexutil/promregex.go b/lib/regexutil/promregex.go
index 8907547a74..e977ef08c1 100644
--- a/lib/regexutil/promregex.go
+++ b/lib/regexutil/promregex.go
@@ -3,6 +3,7 @@ package regexutil
 import (
 	"regexp"
 	"regexp/syntax"
+	"slices"
 	"strings"
 
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil"
@@ -118,12 +119,7 @@ func (pr *PromRegex) MatchString(s string) bool {
 
 	if len(pr.orValues) > 0 {
 		// Fast path - pr contains only alternate strings such as 'foo|bar|baz'
-		for _, v := range pr.orValues {
-			if s == v {
-				return true
-			}
-		}
-		return false
+		return slices.Contains(pr.orValues, s)
 	}
 
 	// Fall back to slow path by matching the original regexp.
diff --git a/lib/storage/index_db_test.go b/lib/storage/index_db_test.go
index 38fbb6b1c5..2d10eeac94 100644
--- a/lib/storage/index_db_test.go
+++ b/lib/storage/index_db_test.go
@@ -922,12 +922,7 @@ func testIndexDBCheckTSIDByName(db *indexDB, mns []MetricName, tsids []TSID, tim
 }
 
 func testHasTSID(tsids []TSID, tsid *TSID) bool {
-	for i := range tsids {
-		if tsids[i] == *tsid {
-			return true
-		}
-	}
-	return false
+	return slices.Contains(tsids, *tsid)
 }
 
 func TestGetRegexpForGraphiteNodeQuery(t *testing.T) {
diff --git a/lib/storage/metric_name.go b/lib/storage/metric_name.go
index 00b3a5368d..d651c2912e 100644
--- a/lib/storage/metric_name.go
+++ b/lib/storage/metric_name.go
@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"fmt"
 	"runtime"
+	"slices"
 	"sort"
 	"strings"
 	"sync"
@@ -373,12 +374,7 @@ func (mn *MetricName) setAllTags(prefix string, skipTags []string, src *MetricNa
 }
 
 func containsString(a []string, s string) bool {
-	for _, x := range a {
-		if x == s {
-			return true
-		}
-	}
-	return false
+	return slices.Contains(a, s)
 }
 
 func hasTag(tags []string, key []byte) bool {
diff --git a/lib/storage/storage_test.go b/lib/storage/storage_test.go
index fffa83d178..29633fb661 100644
--- a/lib/storage/storage_test.go
+++ b/lib/storage/storage_test.go
@@ -724,12 +724,7 @@ func checkLabelNames(lns []string, lnsExpected map[string]bool) error {
 		return fmt.Errorf("unexpected number of label names found; got %d; want at least %d; lns=%q, lnsExpected=%v", len(lns), len(lnsExpected), lns, lnsExpected)
 	}
 	hasItem := func(s string, lns []string) bool {
-		for _, labelName := range lns {
-			if s == labelName {
-				return true
-			}
-		}
-		return false
+		return slices.Contains(lns, s)
 	}
 	for labelName := range lnsExpected {
 		if !hasItem(labelName, lns) {
diff --git a/lib/uint64set/uint64set.go b/lib/uint64set/uint64set.go
index 5112129ac3..bc307e27ed 100644
--- a/lib/uint64set/uint64set.go
+++ b/lib/uint64set/uint64set.go
@@ -2,6 +2,7 @@ package uint64set
 
 import (
 	"math/bits"
+	"slices"
 	"sort"
 	"sync"
 	"sync/atomic"
@@ -891,12 +892,7 @@ func (b *bucket16) has(x uint16) bool {
 }
 
 func (b *bucket16) hasInSmallPool(x uint16) bool {
-	for _, v := range b.smallPool[:b.smallPoolLen] {
-		if v == x {
-			return true
-		}
-	}
-	return false
+	return slices.Contains(b.smallPool[:b.smallPoolLen], x)
 }
 
 func (b *bucket16) del(x uint16) bool {