route_bench.php

<?php

require_once 'vendor/autoload.php';

$kernel = new AppKernel('prod', false);
$kernel->boot();

$router = $kernel->getContainer()->get('router');
$routes = $router->getRouteCollection();
$router->getContext()->setMethod('GET');

$hosts = [
    // all my app's hosts
];

$totalMatchedRoutes = 0;

foreach ($hosts as $host) {
    $router->getContext()->setHost($host);

    foreach (range(0, 5000) as $i) {
        /** @var \Symfony\Component\Routing\Route $route */
        foreach ($routes as $route) {
            if (!$route->getCondition() && (!$route->getMethods() || in_array('GET', $route->getMethods()))) {
                try {
                    $router->match(preg_replace('/\{[^{]+\}/', 'foo', $route->getPath()));
                    $totalMatchedRoutes++;
                } catch (\Symfony\Component\Routing\Exception\ResourceNotFoundException $e) {
                }
            }
        }
    }
}

echo $totalMatchedRoutes.PHP_EOL;