Many people will be running the game with the same results. According to Crytek, the beta is far from optimized and the final version will run much, much smoother.

I'm getting ~30FPS on all high @ 1650x1050

System:
C2Q 6600 @ 3.4GHz
Single 8800GTX OC'ed
Vista Ult. 64bit
4GB RAM

Again, beta is not optimized - The SP demo will be MUCH better for comparison/benching.