diff --git a/bench/Source/ManyNamesSource.php b/bench/Source/ManyNamesSource.php
new file mode 100644
index 00000000000..4f08e1c71fc
--- /dev/null
+++ b/bench/Source/ManyNamesSource.php
@@ -0,0 +1,79 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\Bench\Source;
+
+use Countable;
+use DateTime;
+use DateTimeImmutable;
+
+/**
+ * Fixture parsed by short_name_resolver_bench.php. Deliberately name-heavy:
+ * many fully-qualified references plus docblock types, so resolveFromFile() does real work.
+ * References only real classes so it stays valid if any whole-repo check scans it.
+ */
+final class ManyNamesSource implements Countable
+{
+    /**
+     * @var \PhpParser\Node\Stmt\Class_[]
+     */
+    private array $classes = [];
+
+    /**
+     * @param \PhpParser\Node\Name $name
+     * @return \PhpParser\Node\Expr\New_
+     */
+    public function first(\PhpParser\Node\Name $name): \PhpParser\Node\Expr\New_
+    {
+        $a = new \PhpParser\Node\Scalar\String_('a');
+        $b = new \PhpParser\Node\Identifier('b');
+        $c = new DateTimeImmutable();
+
+        return new \PhpParser\Node\Expr\New_($name);
+    }
+
+    /**
+     * @param \PhpParser\Node\Stmt\Property $property
+     * @return \PhpParser\Comment\Doc
+     */
+    public function second(\PhpParser\Node\Stmt\Property $property): \PhpParser\Comment\Doc
+    {
+        $x = new \PhpParser\Node\Stmt\ClassMethod('x');
+        $y = new \SplStack();
+        $z = new \ArrayObject();
+
+        return new \PhpParser\Comment\Doc('/** */');
+    }
+
+    /**
+     * @param \PhpParser\Node\Arg $arg
+     * @return \PhpParser\Node\Expr\MethodCall
+     */
+    public function third(\PhpParser\Node\Arg $arg): \PhpParser\Node\Expr\MethodCall
+    {
+        $p = new \RuntimeException();
+        $q = new \LogicException();
+        $r = new DateTime();
+
+        return new \PhpParser\Node\Expr\MethodCall(new \PhpParser\Node\Expr\Variable('v'), 'm');
+    }
+
+    /**
+     * @param \PhpParser\Node\Stmt\Use_ $use
+     * @return \PhpParser\Node\Stmt\Namespace_
+     */
+    public function fourth(\PhpParser\Node\Stmt\Use_ $use): \PhpParser\Node\Stmt\Namespace_
+    {
+        $s = new \SplObjectStorage();
+        $t = new \DateInterval('P1D');
+        $u = new \PhpParser\Node\Scalar\Int_(1);
+
+        return new \PhpParser\Node\Stmt\Namespace_(new \PhpParser\Node\Name('N'));
+    }
+
+    public function count(): int
+    {
+        return count($this->classes);
+    }
+}
diff --git a/bench/short_name_resolver_bench.php b/bench/short_name_resolver_bench.php
new file mode 100644
index 00000000000..f0e565cb0c5
--- /dev/null
+++ b/bench/short_name_resolver_bench.php
@@ -0,0 +1,117 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * Benchmark for ShortNameResolver::resolveFromFile() caching.
+ *
+ * Simulates the file-processing convergence loop: the same file is re-queried across
+ * several passes, with its stmts version bumped between passes (as real rules do when
+ * they change nodes). Two access patterns are measured:
+ *
+ *   - single-version: one version, many per-node queries (isolates per-node caching)
+ *   - multi-version:   version bumped each pass, many per-node queries per pass
+ *                      (this is where the filePath-cached vs version-cached behavior differs)
+ *
+ * Run on both branches to compare:
+ *   php bench/short_name_resolver_bench.php
+ *
+ * Reports CPU time (user+sys) and wall time; CPU is the reliable metric, wall is noisy
+ * under concurrent load.
+ */
+
+use Rector\BetterPhpDocParser\PhpDocInfo\PhpDocInfoFactory;
+use Rector\CodingStyle\ClassNameImport\ShortNameResolver;
+use Rector\CodingStyle\NodeAnalyzer\UseImportNameMatcher;
+use Rector\DependencyInjection\LazyContainerFactory;
+use Rector\NodeNameResolver\NodeNameResolver;
+use Rector\PhpDocParser\NodeTraverser\SimpleCallableNodeTraverser;
+use Rector\PhpParser\Node\BetterNodeFinder;
+use Rector\Testing\TestingParser\TestingParser;
+use Rector\ValueObject\Application\File;
+
+require __DIR__ . '/../vendor/autoload.php';
+
+const ITERATIONS = 8;   // convergence passes (stmts version bumps)
+const NODES = 400;      // resolveFromFile() calls per pass (one per FullyQualified node)
+const REPEAT = 25;      // outer repeats, each with a fresh-cache resolver
+
+$rectorConfig = (new LazyContainerFactory())->create();
+$rectorConfig->boot();
+
+/** @var TestingParser $testingParser */
+$testingParser = $rectorConfig->make(TestingParser::class);
+
+$sourceFilePath = __DIR__ . '/Source/ManyNamesSource.php';
+
+// shared stateless dependencies; a fresh ShortNameResolver is built per repeat so its cache starts empty
+$simpleCallableNodeTraverser = $rectorConfig->make(SimpleCallableNodeTraverser::class);
+$nodeNameResolver = $rectorConfig->make(NodeNameResolver::class);
+$betterNodeFinder = $rectorConfig->make(BetterNodeFinder::class);
+$useImportNameMatcher = $rectorConfig->make(UseImportNameMatcher::class);
+$phpDocInfoFactory = $rectorConfig->make(PhpDocInfoFactory::class);
+
+$makeResolver = static fn (): ShortNameResolver => new ShortNameResolver(
+    $simpleCallableNodeTraverser,
+    $nodeNameResolver,
+    $betterNodeFinder,
+    $useImportNameMatcher,
+    $phpDocInfoFactory
+);
+
+$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;
+};
+
+/**
+ * @param callable(): ShortNameResolver $makeResolver
+ */
+$run = static function (bool $bumpVersionEachPass) use (
+    $makeResolver,
+    $testingParser,
+    $sourceFilePath
+): void {
+    $resolver = $makeResolver();
+    $file = $testingParser->parseFilePathToFile($sourceFilePath);
+
+    for ($pass = 0; $pass < ITERATIONS; ++$pass) {
+        if ($bumpVersionEachPass) {
+            // mark the stmts as changed, exactly as a rule that edited the file does
+            $file->changeNewStmts($file->getNewStmts());
+        }
+
+        for ($node = 0; $node < NODES; ++$node) {
+            $resolver->resolveFromFile($file);
+        }
+    }
+};
+
+$measure = static function (bool $bumpVersionEachPass) use ($run, $cpuSeconds): array {
+    // warm up autoloading / parser once, excluded from timing
+    $run($bumpVersionEachPass);
+
+    $cpuStart = $cpuSeconds();
+    $wallStart = hrtime(true);
+
+    for ($repeat = 0; $repeat < REPEAT; ++$repeat) {
+        $run($bumpVersionEachPass);
+    }
+
+    return [
+        'cpu' => $cpuSeconds() - $cpuStart,
+        'wall' => (hrtime(true) - $wallStart) / 1_000_000_000,
+    ];
+};
+
+assert(class_exists(File::class));
+
+$singleVersion = $measure(false);
+$multiVersion = $measure(true);
+
+printf('ShortNameResolver::resolveFromFile benchmark%s', PHP_EOL);
+printf('  iterations=%d nodes=%d repeat=%d%s', ITERATIONS, NODES, REPEAT, PHP_EOL);
+printf('%s', PHP_EOL);
+printf('  single-version  cpu=%.4fs  wall=%.4fs%s', $singleVersion['cpu'], $singleVersion['wall'], PHP_EOL);
+printf('  multi-version   cpu=%.4fs  wall=%.4fs%s', $multiVersion['cpu'], $multiVersion['wall'], PHP_EOL);
diff --git a/rules-tests/CodingStyle/ClassNameImport/ShortNameResolver/ShortNameResolverTest.php b/rules-tests/CodingStyle/ClassNameImport/ShortNameResolver/ShortNameResolverTest.php
index 504f5b6679a..1be437a79e2 100644
--- a/rules-tests/CodingStyle/ClassNameImport/ShortNameResolver/ShortNameResolverTest.php
+++ b/rules-tests/CodingStyle/ClassNameImport/ShortNameResolver/ShortNameResolverTest.php
@@ -54,6 +54,23 @@ public function testResolveShortClassLikeNamesAgainAfterStmtsChange(): void
         $this->assertSame(['RenamedClass'], $this->shortNameResolver->resolveShortClassLikeNames($file));
     }
 
+    public function testResolveFromFileAgainAfterStmtsChange(): void
+    {
+        $file = $this->testingParser->parseFilePathToFile(__DIR__ . '/Fixture/various_imports.php.inc');
+        $this->assertArrayHasKey('VariousImports', $this->shortNameResolver->resolveFromFile($file));
+
+        $class = new NodeFinder()
+            ->findFirstInstanceOf($file->getNewStmts(), Class_::class);
+        $this->assertInstanceOf(Class_::class, $class);
+
+        $class->name = new Identifier('RenamedClass');
+        $file->changeNewStmts($file->getNewStmts());
+
+        $shortNamesAfterChange = $this->shortNameResolver->resolveFromFile($file);
+        $this->assertArrayNotHasKey('VariousImports', $shortNamesAfterChange);
+        $this->assertArrayHasKey('RenamedClass', $shortNamesAfterChange);
+    }
+
     public function testResolveShortClassLikeNamesPerFile(): void
     {
         $firstFile = $this->testingParser->parseFilePathToFile(__DIR__ . '/Fixture/various_imports.php.inc');
diff --git a/rules/CodingStyle/ClassNameImport/ShortNameResolver.php b/rules/CodingStyle/ClassNameImport/ShortNameResolver.php
index 871833c6aff..faa62da361c 100644
--- a/rules/CodingStyle/ClassNameImport/ShortNameResolver.php
+++ b/rules/CodingStyle/ClassNameImport/ShortNameResolver.php
@@ -26,10 +26,14 @@
  */
 final class ShortNameResolver
 {
+    private ?File $shortNamesFile = null;
+
+    private int $shortNamesVersion = 0;
+
     /**
-     * @var array<string, string[]>
+     * @var array<string, string>
      */
-    private array $shortNamesByFilePath = [];
+    private array $shortNamesToFullyQualifiedNames = [];
 
     private ?File $shortClassLikeNamesFile = null;
 
@@ -54,16 +58,16 @@ public function __construct(
      */
     public function resolveFromFile(File $file): array
     {
-        $filePath = $file->getFilePath();
-
-        if (isset($this->shortNamesByFilePath[$filePath])) {
-            return $this->shortNamesByFilePath[$filePath];
+        // re-resolve when the file stmts change, so later iterations don't read a stale map
+        if ($file === $this->shortNamesFile && $file->getNewStmtsVersion() === $this->shortNamesVersion) {
+            return $this->shortNamesToFullyQualifiedNames;
         }
 
-        $shortNamesToFullyQualifiedNames = $this->resolveForStmts($file->getNewStmts());
-        $this->shortNamesByFilePath[$filePath] = $shortNamesToFullyQualifiedNames;
+        $this->shortNamesFile = $file;
+        $this->shortNamesVersion = $file->getNewStmtsVersion();
+        $this->shortNamesToFullyQualifiedNames = $this->resolveForStmts($file->getNewStmts());
 
-        return $shortNamesToFullyQualifiedNames;
+        return $this->shortNamesToFullyQualifiedNames;
     }
 
     /**