This extension declares a Symfony\Component\DependencyInjection\ContainerOptimizerInterface interface.

Simply make your container implement it :

<?php
use Symfony\Component\DependencyInjection\ContainerOptimizerInterface;
use Symfony\Component\DependencyInjection\Container;

class appDevDebugProjectContainer extends Container implements ContainerOptimizerInterface
{

}

The interface will replace the get() method by a C implemented one, more performant hopefully.

> phpize
> ./configure
> make
> make install

• Supports PHP 5.3, 5.4, 5.5 and 5.6
• Supports ZTS