I've been searching on the internet about this issue and I can't find anything about it, so I was wondering if anybody could help me. My MBP is a 2,4 GHz w/ a Nividia 9600m GT. I played the game under Windows XP, Windows 7, Leopard and now on Snow Leopard using this computer, and lately I've been having lag issue with the game. I normally get 110-120 FPS in Full-Screen in the native res. Sometimes, my Framerate will fall to 20 FPS for 2-3 secs and go back to what it normally was. Then this cycle will repeat iself for every 5 secs until I close the game. I really REALLY don't know why it's happening. Lowering video options, closing all the backgroups apps, playing in a windows or using a lower res will not help in any way. When it happens, my CPU and memory aren't loaded. What can I do?