All classes that implement PreloadableRouteProviderInterface in Drupal 9
- class \Drupal\Core\Installer\InstallerRouteProviderLazyBuilder
- class \Drupal\Core\Routing\RouteProvider implements \Symfony\Component\EventDispatcher\EventSubscriberInterface, CacheableRouteProviderInterface, PreloadableRouteProviderInterface
- class \Drupal\Core\Routing\RouteProviderLazyBuilder implements \Symfony\Component\EventDispatcher\EventSubscriberInterface, PreloadableRouteProviderInterface
- class \Drupal\KernelTests\Core\Routing\TestRouteProvider
- class \Drupal\KernelTests\RouteProvider implements PreloadableRouteProviderInterface uses DependencySerializationTrait