Guys, usually the graphics card is the cause of lags on the newer intel macs. A breif list:
MacBook - Intel Graphics, not good for gaming.
Macbook Pro - ATI/Nvidia with 128-256 VRAM, great for gaming (battery goes down to the pooper though)
Mac Mini - Integrated Graphics, not good for gaming.
iMac - Lowend ($999) has Intel Integrated Graphics, not good for gaming. All other models have ATI/Nvidia with 128-256 MB Vram.
Mac Pro - Choice of ATI/Nvidia Graphics, anything you want, great for gaming. If you have this, you can upgrade your graphics card if it isn't working, as this is a standard PC box.
You should have 512 MB or more ram also.
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