I'm using a 2009 MBP with 2.26GHz, 4GB RAM, NVIDIA GeForce 9400M and bootcamped for 32-bit Windows 7. This is an issue that I've been encountering with a lot of games, recently including Fallout: New Vegas, Skyrim and Alpha Protocol. The issue is that these games used to run okay on my system, but now whenever I play them, they'll run normally for a few minutes, but then get really choppy. The weird thing is that sometimes, if I just leave it for a while, the graphics will speed up again, and then a little while later slow back down. Even weirder, if I open the game menu and alt-tab out of the game for a few minutes, then back in, it runs fine for a little while before again going choppy. I don't think it's just a matter of me trying to run games that are too much for the system - for example, with New Vegas, I've read plenty of posts on this forum and others that suggest I should be able to run it perfectly well. Any ideas?