diff --git a/src/Benchmark/Middlewares/DebuggingMiddleware.php b/src/Benchmark/Middlewares/DebuggingMiddleware.php
new file mode 100644
index 0000000..66d7e43
--- /dev/null
+++ b/src/Benchmark/Middlewares/DebuggingMiddleware.php
@@ -0,0 +1,269 @@
+<?php
+declare(strict_types=1);
+
+namespace ArrayAccess\TrayDigita\Benchmark\Middlewares;
+
+use ArrayAccess\TrayDigita\Benchmark\Interfaces\ProfilerInterface;
+use ArrayAccess\TrayDigita\Benchmark\Waterfall;
+use ArrayAccess\TrayDigita\Collection\Config;
+use ArrayAccess\TrayDigita\Event\Interfaces\ManagerInterface;
+use ArrayAccess\TrayDigita\Middleware\AbstractMiddleware;
+use ArrayAccess\TrayDigita\Traits\Http\StreamFactoryTrait;
+use ArrayAccess\TrayDigita\Traits\Service\TranslatorTrait;
+use ArrayAccess\TrayDigita\Util\Filter\Consolidation;
+use ArrayAccess\TrayDigita\Util\Filter\ContainerHelper;
+use ArrayAccess\TrayDigita\Util\Filter\DataType;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+use Throwable;
+use function memory_get_usage;
+use function microtime;
+use function preg_replace;
+use function str_contains;
+use const PHP_INT_MAX;
+use const PHP_INT_MIN;
+
+class DebuggingMiddleware extends AbstractMiddleware
+{
+    protected int $priority = PHP_INT_MIN;
+
+    use StreamFactoryTrait,
+        TranslatorTrait;
+
+    private bool $registered = false;
+
+    private bool $darkMode = false;
+
+    /**
+     * @var ?float
+     */
+    private ?float $requestFloat = null;
+
+    protected function doProcess(
+        ServerRequestInterface $request
+    ): ServerRequestInterface {
+        if (!$this->registered) {
+            $this->requestFloat = $request->getServerParams()['REQUEST_TIME_FLOAT']??null;
+            $this->registered = true;
+            $this->registerBenchmarkDebugBar();
+        }
+        return $request;
+    }
+
+    protected function registerBenchmarkDebugBar(): void
+    {
+        // do not run if cli
+        if (Consolidation::isCli()) {
+            return;
+        }
+        $container = $this->getContainer();
+        $config = ContainerHelper::use(Config::class, $container);
+        $manager = ContainerHelper::use(ManagerInterface::class, $container);
+        if (!$config || !$manager) {
+            return;
+        }
+        if (!$config instanceof Config
+            || !($config = $config->get('environment')) instanceof Config
+        ) {
+            return;
+        }
+        if ($config->get('showPerformance') === true) {
+            $manager->attach(
+                'response.final',
+                [$this, 'printPerformance'],
+                priority: PHP_INT_MAX - 5
+            );
+        }
+
+        if ($config->get('profiling') !== true || $config->get('debugBar') !== true) {
+            return;
+        }
+
+        $this->darkMode = $config->get('debugBarDarkMode') === true;
+        // @attach(response.final)
+        $manager->attach(
+            'response.final',
+            [$this, 'renderDebugBar'],
+            priority: PHP_INT_MAX - 100
+        );
+    }
+
+    private function renderDebugBar($response) : mixed
+    {
+        $manager = $this->getManager();
+
+        // @detach(response.final)
+        $manager?->detach(
+            'response.final',
+            [$this, 'renderDebugBar'],
+            PHP_INT_MAX - 100
+        );
+
+        if (!$response instanceof ResponseInterface) {
+            return $response;
+        }
+
+        $container = $this->getContainer();
+        $config = ContainerHelper::use(Config::class, $container)?->get('environment');
+        $config = $config instanceof Config ? $config : new Config();
+
+        // maybe override? disabled!
+        if ($config->get('debugBar') !== true) {
+            return $response;
+        }
+
+        // if profiler disabled, stop here!
+        $profiler = ContainerHelper::use(ProfilerInterface::class, $container);
+        $waterfall = ContainerHelper::use(Waterfall::class, $container);
+        if (!$profiler?->isEnable() || ! $waterfall || !DataType::isHtmlContentType($response)) {
+            return $response;
+        }
+
+        // DO STOP BENCHMARK
+        $benchmark = ($profiler->getGroup('response')
+            ??$profiler->getGroup('manager'))
+            ?->get('response.final');
+        $benchmark?->stop([
+            'duration' => $benchmark->convertMicrotime(microtime(true)) - $benchmark->getStartTime(),
+            'stopped' => true
+        ]);
+        $benchmark = $profiler
+            ->getGroup('httpKernel')
+            ?->get('httpKernel.dispatch');
+        $benchmark?->stop([
+            'duration' => $benchmark->convertMicrotime(microtime(true)) - $benchmark->getStartTime()
+        ]);
+        $benchmark?->setMetadataRecord('stopped', true);
+        // END BENCHMARK
+        $serverParams = $this->request?->getServerParams()??$_SERVER;
+        $startTime = (
+            $this->requestFloat
+            ??$serverParams['REQUEST_TIME_FLOAT']
+            ??$profiler->getStartTime()
+        );
+
+        // get origin performance
+        $performanceOrigin = microtime(true) - $startTime;
+        $memoryOrigin = Consolidation::sizeFormat(memory_get_usage(), 3);
+
+        // start
+        $body = (string) $response->getBody();
+        $streamFactory = $this->getStreamFactory();
+        $darkMode = $this->darkMode;
+        $found = false;
+        if (str_contains($body, '<!--(waterfall)-->')) {
+            $found = true;
+            $body = preg_replace(
+                '~<!--\(waterfall\)-->~',
+                $waterfall->render(darkMode: $darkMode),
+                $body,
+                1
+            );
+        } else {
+            $regexes = [
+                '~(<(body)[^>]*>.*)(</\2>\s*</html>\s*(?:<\!\-\-.*)?)$~ism',
+                '~(<(head)[^>]*>.*)(</\2>\s*<body>)~ism',
+                '~(<(html)[^>]*>.*)(</\2>\s*(?:<\!\-\-.*)?)~ism',
+            ];
+            foreach ($regexes as $regex) {
+                if (!preg_match($regex, $body)) {
+                    continue;
+                }
+                $body = preg_replace_callback(
+                    $regex,
+                    static function ($match) use ($waterfall, $darkMode) {
+                        return $match[1] . "\n" . $waterfall->render(darkMode: $darkMode) . "\n" . $match[3];
+                    },
+                    $body
+                );
+                $found = true;
+                break;
+            }
+        }
+
+        if (!$found) {
+            $body .= "\n";
+            $body .= $waterfall->render(darkMode: $darkMode);
+            $body .= "\n";
+        }
+        // stop
+        $waterfall = null;
+        unset($waterfall);
+
+        // doing clear
+        $profiler->clear();
+        $performanceEnd = microtime(true) - $startTime;
+        return $response->withBody(
+            $streamFactory->createStream(
+                $body
+                .sprintf(
+                    "\n<!-- (%s : %s ms / %s: %s) ~ (+waterfall ~ %s : %s ms / %s: %s) -->",
+                    $this->translate('rendered time', context: 'benchmark'),
+                    $profiler->convertMicrotime($performanceOrigin),
+                    $this->translate('memory usage', context: 'benchmark'),
+                    $memoryOrigin,
+                    $this->translate('rendered time', context: 'benchmark'),
+                    $profiler->convertMicrotime($performanceEnd),
+                    $this->translate('memory usage', context: 'benchmark'),
+                    Consolidation::sizeFormat(memory_get_usage(), 3),
+                )
+            )
+        );
+    }
+
+    /**
+     * @param ResponseInterface $response
+     * @return ResponseInterface
+     */
+    private function printPerformance(ResponseInterface $response): ResponseInterface
+    {
+        $this->getManager()?->detach(
+            'response.final',
+            [$this, 'printPerformance'],
+            priority: PHP_INT_MAX - 5
+        );
+        $container = $this->getContainer();
+        $config = ContainerHelper::use(Config::class, $container)?->get('environment');
+        $config = $config instanceof Config ? $config : new Config();
+
+        // maybe override? disabled!
+        if ($config->get('showPerformance') !== true) {
+            return $response;
+        }
+
+        // check content type
+        if (!DataType::isHtmlContentType($response)
+            || ! $response->getBody()->isWritable()
+        ) {
+            return $response;
+        }
+        try {
+            $response->getBody()->seek($response->getBody()->getSize());
+        } catch (Throwable) {
+            // pass
+        }
+        $serverParams = $this->request?->getServerParams()??$_SERVER;
+        $startTime = (
+            $this->requestFloat
+            ??$serverParams['REQUEST_TIME_FLOAT']
+            ??$serverParams['REQUEST_TIME']
+        );
+        $str = sprintf(
+            "\n<!-- %s -->",
+            sprintf(
+                '(%s: %s ms / %s: %s / %s: %s)',
+                $this->translate('rendered time', context: 'benchmark'),
+                round(
+                    (microtime(true) * 1000 - $startTime * 1000),
+                    4
+                ),
+                $this->translate('peak memory usage', context: 'benchmark'),
+                Consolidation::sizeFormat(memory_get_peak_usage(), 3),
+                $this->translate('memory usage', context: 'benchmark'),
+                Consolidation::sizeFormat(memory_get_usage(), 3)
+            )
+        );
+        $response->getBody()->write($str);
+        return $response;
+    }
+}