I had horrid lag when going outside sub, turned off vsync and smooth now. I have everything maxed and 2x AA with edge detect. Only problem with turning off vsync is crossfire only uses one core on my 4870x2 instead of two. Hopefully an ATI driver update will fix this so I can crank up the AA.
Some are saying to set affinity to one core with task manager, but I never had to do this. Might work for some of you.
Specs:
AMD Phenom II x4 965 @ 3.4 ghz
4 Gigs RAM
Radeon 4870x2
Windows 7 64-bit
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