I tried the beta patch last night and got the impression that it had afforded the game a boost in performance. AI movement "appeared" a bit smoother and more coherent. I've not had the time to do benchmarks and check actual framerates, though. There was,in any case, a good deal more GPU activity as evidenced by a significant increase in GPU temps -- from an average 67°c to around 75°c on both cards, which I take as a good sign. (My PC is spotlessly clean at the moment, so I cannot attribute the added heat to poor hardware maintenance. Also, I tested other games and did not see any increase in GPU temps playing those.)
Like most everybody else, however, I'm a bit put off by the new animation speeds. Better framerates need not mean faster AI movement, after all.
My PC specs are as follows: i7 870 @ 3.2 GHz, ASUS Maximus III Extreme motherboard, 2 x GTX 470 (x16/x16 SLI), 4GB RAM (CL7 GSkill Ripjaws), 64-bit Windows 7 Ultimate.