I have totally standard new Mac Pro (8-Core etc). I usually have a few simple apps running at the same time... Currently a UML App, Adium, Firefox, Skype, Mail & iTunes, and obviously... WoW. For some reason, every now and again, it freezes, then returns to it's normal (high) FPS... anything I can do to speed it up? I'm thinking whether it's really worth buying it 8800 GT?