Originally Posted by CybrMike
If not already installed, might want to install eAccelerator. It caches PHP scripts. Benchmarks put it at about 4x the speed of just Apache + PHP.
Currently XCache is running with lighttpd. We will definitely use eAccelerator when we switch to Apache. It's an amazing tool.
For those of you who read these but don't keep up with this stuff, these caching tools basically store the processed php scripts in RAM (which is very fast) so when a page is called the server does not have to read and process them each time from the hard drive (which is very slow & creates more load). Here is a wikipedia link to eAccelerator
. They offer huge performance gains and if you have a website that runs on PHP you should check to see if your host offers php caching.
We are also using a tool called memcache (wikipedia link
) that helps cache on the database side of things.