I don't normally get this excited over performance tweaking articles, but this one is totally worth doing. If you use Firefox, have a fast connection, and use a relatively modern machine, go to ExtremeTech's article right now and try out all of their config tweaks. My browser feels twice as fast as is was before. It's REALLY fast, and it's strange how excited I'm getting over it. :)
Anyway, it's all about how fast computers feel.