I agree with Ominae. I can't remember if I'm getting any fps drops, and i'm playing at the same resolution with the details maxed out. Res 1280x960. I average 60-70 fps, i think... i hardly even check, i just know everything SEEMS smoother. In u2xmp i would get fps drops quite often... sometimes all the way down to 15-20 fps. My average was somewhere between 50 and 65.
I played a single player match with 31 bots, and i had a stable 60+ fps the whole time. These bots duck and travel in packs, you realize... so the red bots and the blue bots would all spawn at the same time, and meet in the same place. 16 rockets at a time from each side, and i had perfect performance.