I'd be interested in any advice on this also, and have done the same as the above poster including manually editing and saving my config to turn off texture streaming. Played it for about 1h and starting to feel sick from the juddering frankly!
Consistently getting 60fps though...
My system:
2* GeForce GTX670
Raptor SSD
16gb ram
Asus Xonar DS SS
Intel i5 4.0Ghz OC'ed to 4.4
