"Drupal has a page cache mechanism which stores dynamically generated web pages in the database. By caching a web page, Drupal does not have to create the page each time it is requested. Only pages requested by anonymous visitors (users that have not logged on) are cached. Once users have logged on, caching is disabled for them since the pages are personalized in various ways. Because this represents two different modes of operation, I investigated Drupal's behavior with and without page caching."