I have Debian Squeeze installed on a 3.2 GHz P4, 512 MB, ATI Mobility Radeon, and I don't have this problem in Iceweasel, for what it's worth.
The problem could be how flash is interacting with your graphics card. Also, try a different browser to see if the problem persists.
I don't know much about video games, but 2500 FPS sounds impressive.
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