I've got GF2, I get the same gradual decay of graphics... I play for a while, then the picture begins to decay, the mouse moves slowly, the enemies jerk about the screen, etc., just like after ALT-TABing.
The solution? I switched to software mode The gfx are pretty much the same as running under GF2 (in fact, I can see no difference at all...), but there's no decay after time -- I can leave the game running for DAYS straight, which I often do since that Windows comp is used for nothing but gaming, without graphics problems.
SO SWITCH TO SOFTWARE!
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