I run Skyrim on a Windows partition on my 27 inch iMac and I don't get any lag at all. In fact i have about 8 Windows computers in the house and one with pretty high specs but the iMac p...es all over it. Oh, and the graphics are awesome Super HiRes). Super fast load screens too. I run with 16 gm memory too. Go Apple (with a side dish of Windows). Funny, I can't do it the other way round?