By default Apache loads lots of modules. If you are running only Drupal based websites on your VPS / Server, you should consider disabling un-needed Apache modules. This will save lots of memory and optimize server.
In this tutorial I will explain how to enable Drupal Clean URL support on a CentOS / RedHat Linux server. Step 1 Before making any change in Apache configuration file, we will first make a backup of the Apache configuration file. Login as root to your server via SSH and run below commands: