I have broken this guide into 6 parts. Networking, file system, memory performance, freeing up memory, startup/shutdown and then the other stuff. I've tried to pack as much performance related tweaking here as I can but there's always more to be uncovered. I will update this article as frequently as possible. I know there's a million tweaks that I'm missing here but I am trying to keep this guide dedicated to tweaks that directly affect your performance.