Symfony2 is not ready for production yet. The final release is planned for March 2011 and will support PHP 5.3.2 and up. Use symfony 1.4 for your projects. HTTP Cache¶ The best way to improve the performance of an application is probably to cache its output and bypass it altogether. Of course, this is not possible for highly dynamic websites, or is it? This document will show you how Symfony2 cach