Hi, I play CoD4 on a 2009 13" Macbook Pro. My specs are a Geforce GT 9400m (256), a 2.26 C2D, 4 Gigs of 1333mhz RAM. I play CoD4 at 1152x 720 or something like that. Textures are all high, and the rest of the stuff is off, like shadows. I usually get around 30ish FPS on Multiplayer. My issue is that, after about three-and-a-half minutes of gameplay in ANY game with ANY connection speed, even if it's been smooth before, I get lag/hiccups that will have short periods of slowdown, then fast, then short periods of slowdown (1.5s), then fast again. This ends after around two minutes. Is this performance issue due to the GPU? Anyone else get this?