Add another one to the list of things that I’ve put off for a long time, only to realize that they’re simple to do, and have a great pay-off.
Today I installed and enabled APC, which immediately doubled the speed of my PHP applications. And, more importantly, the load on the server immediately dropped by a factor of 10.
I understand that there are other php caching accelerating thingies out there, and I expect that everyone has their opinion of which one is the best. But I’m very impressed with APC.