If you're reading this blog post then you probably know by now that caching Drupal pages with varnish is pretty easy with Drupal 7. So long as the pages are anonymous. As soon as you're logged in however, the game changes. Infact as soon as you obtain a session with PHP, the game changes and you instead rely on block level caching and views and panels caching. For some sites that will be acceptable. But when you start to scale the amount of users hitting your site, PHP just can't keep up and you'll either start to run out of connections or max out your memory.

Tags: Drupal PlanetDrupal