diff --git a/phpstan.neon b/phpstan.neon
index f45cc00..f2fbd03 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -1,6 +1,6 @@
 parameters:
 	ignoreErrors:
-		- '#n method "ReactParallel\\Psr15Adapter\\ReactMiddleware::__invoke", caught "Throwable" must be rethrown.#'
+		- '#n method "ReactParallel\\Psr15Adapter\\ReactMiddleware::__construct", caught "Throwable" must be rethrown.#'
 
 includes:
 	- vendor/wyrihaximus/async-test-utilities/rules.neon
\ No newline at end of file
diff --git a/src/ReactMiddleware.php b/src/ReactMiddleware.php
index 73a098c..fd2b0a2 100644
--- a/src/ReactMiddleware.php
+++ b/src/ReactMiddleware.php
@@ -26,20 +26,25 @@ final class ReactMiddleware
 
     private PoolInterface $runtime;
 
-    private MiddlewareInterface $middleware;
+    private string $fun;
 
     public function __construct(Factory $streamFactory, PoolInterface $pool, MiddlewareInterface $middleware)
     {
         $this->streamFactory = $streamFactory;
         $this->runtime       = $pool;
-        $this->middleware    = $middleware;
+        $this->fun           = serialize(new SerializableClosure(static function (ServerRequestInterface $request, string $input, string $output) use ($middleware): PromiseInterface {
+            try {
+                return resolve($middleware->process($request, new Psr15RequestHandlerAdapter(Channel::open($input), Channel::open($output))));
+            } catch (Throwable $throwable) {
+                return reject($throwable);
+            }
+        }));
     }
 
     public function __invoke(ServerRequestInterface $request, callable $next): PromiseInterface
     {
         return new Promise(function (callable $resolve, callable $reject) use ($request, $next): void {
-            $name       = spl_object_hash($this) . '_' . bin2hex(random_bytes(32));
-            $middleware = $this->middleware;
+            $name = spl_object_hash($this) . '_' . bin2hex(random_bytes(32));
 
             $input  = Channel::make($name . '_to_thread', Channel::Infinite);
             $output = Channel::make($name . '_from_thread', Channel::Infinite);
@@ -52,19 +57,12 @@ public function __invoke(ServerRequestInterface $request, callable $next): Promi
                 $input->send($response);
             }, $reject);
 
-            $fun     = serialize(new SerializableClosure(static function (ServerRequestInterface $request, Channel $input, Channel $output) use ($middleware): PromiseInterface {
-                try {
-                    return resolve($middleware->process($request, new Psr15RequestHandlerAdapter($input, $output)));
-                } catch (Throwable $throwable) {
-                    return reject($throwable);
-                }
-            }));
             $request = serialize($request);
-            $this->runtime->run(static function (string $fun, string $request, Channel $input, Channel $output): PromiseInterface {
+            $this->runtime->run(static function (string $fun, string $request, string $input, string $output): PromiseInterface {
                 $request = unserialize($request);
 
                 return resolve((unserialize($fun))($request, $input, $output));
-            }, [$fun, $request, $input, $output])->then($resolve, $reject);
+            }, [$this->fun, $request, (string) $input, (string) $output])->then($resolve, $reject);
         });
     }
 }
diff --git a/tests/Psr15MiddlewareStub.php b/tests/Psr15MiddlewareStub.php
index 8065e7c..d3dfe62 100644
--- a/tests/Psr15MiddlewareStub.php
+++ b/tests/Psr15MiddlewareStub.php
@@ -15,7 +15,7 @@ final class Psr15MiddlewareStub implements MiddlewareInterface
 {
     public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
     {
-        sleep(1);
+        sleep((int)$request->getAttribute('sleep'));
         return $handler->handle($request)->withAddedHeader('__CLASS__', __CLASS__);
     }
 }
diff --git a/tests/ReactMiddlewareTest.php b/tests/ReactMiddlewareTest.php
index 4e7a31b..860e7c8 100644
--- a/tests/ReactMiddlewareTest.php
+++ b/tests/ReactMiddlewareTest.php
@@ -14,6 +14,7 @@
 use RingCentral\Psr7\Response;
 use RingCentral\Psr7\ServerRequest;
 use WyriHaximus\AsyncTestUtilities\AsyncTestCase;
+use function React\Promise\all;
 use function React\Promise\resolve;
 
 /**
@@ -24,7 +25,7 @@ final class ReactMiddlewareTest extends AsyncTestCase
     /**
      * @test
      */
-    public function handle(): void
+    public function one(): void
     {
         $rnd = bin2hex(random_bytes(1024));
         $loop = Factory::create();
@@ -32,6 +33,7 @@ public function handle(): void
         $stub = new Psr15MiddlewareStub();
         $middleware = new ReactMiddleware(new StreamFactory(new EventLoopBridge($loop)), $pool, $stub);
         $request = new ServerRequest('GET', 'https://example.com/');
+        $request = $request->withAttribute('sleep', 1);
         $request = $request->withAttribute('body', $rnd);
 
         $promise = $middleware(
@@ -48,4 +50,39 @@ static function (ServerRequestInterface $request): PromiseInterface {
         self::assertSame($rnd, $response->getBody()->getContents());
         self::assertSame(Psr15MiddlewareStub::class, $response->getHeaderLine('__CLASS__'));
     }
+
+    /**
+     * @test
+     */
+    public function five(): void
+    {
+        $loop = Factory::create();
+        $pool = new Infinite($loop, 10);
+        $stub = new Psr15MiddlewareStub();
+        $middleware = new ReactMiddleware(new StreamFactory(new EventLoopBridge($loop)), $pool, $stub);
+        $baseRequest = new ServerRequest('GET', 'https://example.com/');
+        $requests = [
+            'a' => $baseRequest->withAttribute('body', '1')->withAttribute('sleep', 5),
+            'b' => $baseRequest->withAttribute('body', '2')->withAttribute('sleep', 1),
+            'c' => $baseRequest->withAttribute('body', '3')->withAttribute('sleep', 3),
+        ];
+
+        $promises = [];
+        foreach ($requests as $request) {
+            $promises[] = $middleware(
+                $request,
+                static function (ServerRequestInterface $request): PromiseInterface {
+                    return resolve(new Response(666, [
+                        'X-Time' => time(),
+                    ], new ReadOnlyStringStream($request->getAttribute('body'))));
+                }
+            );
+        }
+
+        /** @var array<ResponseInterface> $responses */
+        $responses = $this->await(all($promises), $loop, 13.666);
+        \Safe\usort($responses, fn (ResponseInterface $a, ResponseInterface $b) => (int)$a->getHeaderLine('X-Time') > (int)$b->getHeaderLine('X-Time'));
+
+        self::assertSame(['2', '3', '1'], array_map(fn (ResponseInterface $response) => $response->getBody()->getContents(), $responses));
+    }
 }