As described in http://symfony.com/blog/new-in-symfony-2-7-twig-as-a-first-class-citizen#what-about-performance, there is a performance penalty when using templating sub-system.

ControllerTrait::render() tries to render with templating first, but one can optimize controllers by overriding it in base controller like:

public function render($view, array $parameters = [], Response $response = null)
{
    if (null === $response) {
        $response = new Response();
    }

    $response->setContent($this->get('twig')->render($view, $parameters));

    return $response;
}

The method ControllerTrait::render() is considered final since version 3.4, so it cannot be overridden any more, and this optimization is no longer possible.

One possibility can be:

templating:
        enabled: false

but that can cause issues with some third party code that rely on templating service.

So basically what I am trying to accomplish is to keep this optimization possible for controllers.

One idea was to try twig first in ControllerTrait::render(), but that would probably break in some cases.

So, is there a workaround I am not aware of, or is there something we can do to allow this kind of optimizations in future versions?