Jumpy game play on new imac 21.5

I have just purchased a new imac 21.5 with a radeon 4650 graphics card and am experiencing jumpy game play on WOW and other games (even simple games such as Farmville on Facebook) Let me know if someone could please give me some help. Thanks

Welcome to Discussions, your signature says 10.6.1 you should update SL to 10.6.2 as there may have been some fixes for graphics.

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