frame rate cycling: GeFor 9400M

Mac Technical Support
Every time I start playing, the game has about a 3 second frame rate cycle from looking "normal", to slowing way down, to "normal" again - all in about 3 seconds. This cycle continues for a random amount of time - sometimes it goes away after 5 minutes, sometimes it continues on for the entire time I play.

When it does fix itself, it seems like there is no real cause for it suddenly playing normally. I've tried forcing it to fix itself by going into windowed mode and changing the aspect ratio, but neither fix it.

This has been a problem for me since the "big mac fix" a month or so after launch. My Mac is one of the unlucky with GeForce 9400M graphics cards, which they had trouble with at launch.

15-inch, 2.53GHz, Mid 2009
Processor 2.53 GHz Intel Core 2 Duo
Memory 4 GB 1067 MHz DDR3
Graphics NVIDIA GeForce 9400M 256 MB
Software Mac OS X Lion 10.7.5 (11G63)

Anyone have any tips on forcing a fix for this? Thanks!

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