diff --git a/bench/annotation_to_attribute_generic_tag_bench.php b/bench/annotation_to_attribute_generic_tag_bench.php
new file mode 100644
index 00000000000..26cf6072a14
--- /dev/null
+++ b/bench/annotation_to_attribute_generic_tag_bench.php
@@ -0,0 +1,102 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * Benchmark for AnnotationToAttributeRector::processGenericTags().
+ *
+ * For every generic doc tag it scans the whole configured annotation list, comparing
+ * strtolower($desiredTag) with the tag name. Upgrade sets configure many entries, so this is a
+ * per-tag linear scan.
+ *
+ * This bench drives refactor() over many class methods whose docblock holds a single generic tag
+ * that is NOT in the config (the common case). A bare generic tag is not a DoctrineAnnotationTagValueNode,
+ * so the processDoctrineAnnotationClasses()/matchAnnotationToAttribute() path is skipped and only the
+ * processGenericTags() scan is exercised.
+ *
+ * Run on both branches to compare:
+ *   php bench/annotation_to_attribute_generic_tag_bench.php
+ *
+ * Reports CPU time (user+sys) and wall time; CPU is the reliable metric, wall is noisy under
+ * concurrent load.
+ */
+
+use PhpParser\Node\Stmt\ClassMethod;
+use Rector\DependencyInjection\LazyContainerFactory;
+use Rector\Php80\Rector\Class_\AnnotationToAttributeRector;
+use Rector\Php80\ValueObject\AnnotationToAttribute;
+use Rector\PhpParser\Node\BetterNodeFinder;
+use Rector\Testing\TestingParser\TestingParser;
+
+require __DIR__ . '/../vendor/autoload.php';
+
+const ENTRIES = 400; // configured annotation-to-attribute entries
+const METHODS = 100; // class methods with a generic doc tag per pass
+const REPEAT = 200;  // outer repeats over the whole set
+
+$rectorConfig = (new LazyContainerFactory())->create();
+$rectorConfig->boot();
+
+/** @var TestingParser $testingParser */
+$testingParser = $rectorConfig->make(TestingParser::class);
+
+/** @var BetterNodeFinder $betterNodeFinder */
+$betterNodeFinder = $rectorConfig->make(BetterNodeFinder::class);
+
+$rector = $rectorConfig->make(AnnotationToAttributeRector::class);
+
+$annotationsToAttributes = [];
+for ($i = 0; $i < ENTRIES; ++$i) {
+    $annotationsToAttributes[] = new AnnotationToAttribute('Bench\\SomeAnnotation' . $i);
+}
+
+$rector->configure($annotationsToAttributes);
+
+$source = "<?php\n\nnamespace Bench;\n\nclass SomeClass\n{\n";
+for ($i = 0; $i < METHODS; ++$i) {
+    // a bare generic tag deliberately absent from the configured entries
+    $source .= "    /**\n     * @freshTag{$i}\n     */\n    public function method{$i}()\n    {\n    }\n\n";
+}
+
+$source .= "}\n";
+
+$sourceFilePath = tempnam(sys_get_temp_dir(), 'bench_') . '.php';
+file_put_contents($sourceFilePath, $source);
+
+$stmts = $testingParser->parseFileToDecoratedNodes($sourceFilePath);
+
+/** @var ClassMethod[] $classMethods */
+$classMethods = $betterNodeFinder->findInstanceOf($stmts, ClassMethod::class);
+
+$cpuSeconds = static function (): float {
+    $usage = getrusage();
+    return $usage['ru_utime.tv_sec'] + $usage['ru_utime.tv_usec'] / 1_000_000
+        + $usage['ru_stime.tv_sec'] + $usage['ru_stime.tv_usec'] / 1_000_000;
+};
+
+$run = static function () use ($rector, $classMethods): void {
+    foreach ($classMethods as $classMethod) {
+        $rector->refactor($classMethod);
+    }
+};
+
+// warm up autoloading/reflection caches once, excluded from timing
+$run();
+
+$wallStart = microtime(true);
+$cpuStart = $cpuSeconds();
+
+for ($repeat = 0; $repeat < REPEAT; ++$repeat) {
+    $run();
+}
+
+$cpu = $cpuSeconds() - $cpuStart;
+$wall = microtime(true) - $wallStart;
+
+@unlink($sourceFilePath);
+
+$totalCalls = REPEAT * count($classMethods);
+
+printf('entries: %d, methods: %d, repeats: %d, refactor() calls: %d%s', ENTRIES, count($classMethods), REPEAT, $totalCalls, PHP_EOL);
+printf('CPU:  %.4f s  (%.3f us/call)%s', $cpu, $cpu / $totalCalls * 1_000_000, PHP_EOL);
+printf('wall: %.4f s%s', $wall, PHP_EOL);
diff --git a/rules/Php80/Rector/Class_/AnnotationToAttributeRector.php b/rules/Php80/Rector/Class_/AnnotationToAttributeRector.php
index f166ac63e68..e5e7c0fb3d8 100644
--- a/rules/Php80/Rector/Class_/AnnotationToAttributeRector.php
+++ b/rules/Php80/Rector/Class_/AnnotationToAttributeRector.php
@@ -63,6 +63,11 @@ final class AnnotationToAttributeRector extends AbstractRector implements Config
      */
     private array $annotationsToAttributes = [];
 
+    /**
+     * @var array<string, AnnotationToAttribute[]>
+     */
+    private array $annotationsToAttributesByTag = [];
+
     public function __construct(
         private readonly PhpAttributeGroupFactory $phpAttributeGroupFactory,
         private readonly AttrGroupsFactory $attrGroupsFactory,
@@ -178,6 +183,12 @@ public function configure(array $configuration): void
         Assert::allIsAOf($configuration, AnnotationToAttribute::class);
 
         $this->annotationsToAttributes = $this->resolveWithChangedAttributesClass($configuration);
+
+        // bucket by lowercased tag for the generic-tag path
+        $this->annotationsToAttributesByTag = [];
+        foreach ($this->annotationsToAttributes as $annotationToAttribute) {
+            $this->annotationsToAttributesByTag[strtolower($annotationToAttribute->getTag())][] = $annotationToAttribute;
+        }
     }
 
     public function provideMinPhpVersion(): int
@@ -234,12 +245,7 @@ private function processGenericTags(PhpDocInfo $phpDocInfo): array
                 return null;
             }
 
-            foreach ($this->annotationsToAttributes as $annotationToAttribute) {
-                $desiredTag = $annotationToAttribute->getTag();
-                if (strtolower($desiredTag) !== strtolower($tag)) {
-                    continue;
-                }
-
+            foreach ($this->annotationsToAttributesByTag[strtolower($tag)] ?? [] as $annotationToAttribute) {
                 // make sure the attribute class really exists to avoid error on early upgrade
                 if (! $this->reflectionProvider->hasClass($annotationToAttribute->getAttributeClass())) {
                     continue;