# UNDF: UNDF-2026-000001093
--- a/models/asymkey/ssh_key.go
+++ b/models/asymkey/ssh_key.go
@@ -378,19 +378,22 @@ func synchronizePublicKeys(ctx context.Context, s *auth.Source, usr *user_model.
 	// Process the provided keys to remove duplicates and name part
-	var providedKeys []string
+	providedKeysSet := make(map[string]struct{})
+	var providedKeys []string
 	for _, v := range sshPublicKeys {
 		sshKeySplit := strings.Split(v, " ")
 		if len(sshKeySplit) > 1 {
 			key := strings.Join(sshKeySplit[:2], " ")
-			if !util.SliceContainsString(providedKeys, key) {
+			if _, exists := providedKeysSet[key]; !exists {
+				providedKeysSet[key] = struct{}{}
 				providedKeys = append(providedKeys, key)
 			}
 		}
 	}

 	// Check if Public Key sync is needed
@@ -399,14 +402,16 @@ func synchronizePublicKeys(ctx context.Context, s *auth.Source, usr *user_model.

 	// Add new Public SSH Keys that doesn't already exist in DB
+	giteaKeysSet := make(map[string]struct{}, len(giteaKeys))
+	for _, k := range giteaKeys {
+		giteaKeysSet[k] = struct{}{}
+	}
 	var newKeys []string
 	for _, key := range providedKeys {
-		if !util.SliceContainsString(giteaKeys, key) {
+		if _, exists := giteaKeysSet[key]; !exists {
 			newKeys = append(newKeys, key)
 		}
 	}
 	if AddPublicKeysBySource(ctx, usr, s, newKeys) {
 		sshKeysNeedUpdate = true
 	}

 	// Mark keys from DB that no longer exist in the source for deletion
 	var giteaKeysToDelete []string
 	for _, giteaKey := range giteaKeys {
-		if !util.SliceContainsString(providedKeys, giteaKey) {
+		if _, exists := providedKeysSet[giteaKey]; !exists {
 			log.Trace("synchronizePublicKeys[%s]: Marking Public SSH Key for deletion for user %s: %v", s.Name, usr.Name, giteaKey)
 			giteaKeysToDelete = append(giteaKeysToDelete, giteaKey)
 		}
 	}