Strange but I seem to be the only one getting finer performance with wse2 when I also limit fps to 60. I mean maxing out antialiasing in the unscripted version gave me random fps drops but I don't experience that with wse2 now. The overall performace seems to be better, if not a lot. And here is my rig, quite similar to wiltzu's actually:
AMD phenom 2 x6 1100 BE,
radeon hd 6950 2gb ddr5,
8 gb ddr3 ram
and running on win 7 64 bit.