Played about 4-5 hours now, just reported in at TF29 after the first mission and I have to say I'm pretty pleasantly surprised with the performance on my rig so far. I'm on an i7 930, 6GB RAM and a GTX 770 (2GB) and I'm running the game on pretty much all High including textures, Ambient Occlusion and all the lighting/tessellation options etc. (exceptions are shadows are on Medium, Temporal AA and contact hardening off) and I'm getting no lower than 30fps, it averages around 40fps+ which is more than playable on a controller (yes, I use a pad on my PC as its hooked up to our HDTV). I can't guarantee that if I was still playing with a mouse that I'd be singing the same tune...