Just an FYI for everybody about potential ways to fix the slowdown.
My specs
i5-2500k
8gb ram
Radeon 6850 1gb
Windows 7, 64 bit.
I turned motion blur off, and put everything else on high at 1080p and 60fps. This would get me slow-mo. I turned off AA, and things ran like butter.
But, I still wanted 60fps, so I tried overclocking my 2500k to 3.8ghz.
Now, everything runs great at 1080p with 60fps and 8x AA and everything on high (motion blur off though, cause it looks crappy).
So, I didn't necessarily expect overclocking my cpu to fix the slowdown problem, which seems to be an AA issue, but it totally fixed it. The stock turbo mode on that chip runs a 3.3ghz, so a bump up to 3.8ghz isn't something insane... I thought AA would be more of a video card issue, but overclocking my cpu completely fixed it.
It makes me wonder if the game is properly optimized to make full use of the available hardware. I would think that a i5-2500k at stock speeds would crush a game from 2005. I think, my system in general, would be able to handle this game with ease... Like I said, maybe there is more room for optimization with another patch or two.