Symfony has a really powerful cache mechanism, but if you turn it on and don’t configure it, it will cache one file for *every possible url*, and in the case of a dynamic site with thousands of pages, this grows to many gigabytes very fast. This is especially a problem if you have a dynamic search feature, and you have search-friendly URLS where you convert query parameters to /a/friendly/path/like/this. The number of unique paths that generate content on your site is literally infinite, since the URL can include anything the user types in the search box. More…