If you are in a position to make technical decisions and you choose Symfony2 and don't even consider that you should have a cache or three in place, you should

If you are in a position to make technical decisions and you choose Symfony2 and don't even consider that you should have a cache or three in place, you should be dragged behind a van by your teeth. Caching in PHP has reached a point where turning it on is as simple as installing a package and setting a flag.