Just an update to this, sort of.
I run a 2.4 quad core, with a GTX 260 (expensive but well worth it) video card, 4 gigs of ram, and vista 64.
I get easily over 50 fps everywhere. I run on super high everything with anti aliasing at 16x. I still run at 30+ in a seige or a raid.
The fixes have been big and effective. there stil are random problems, but alot less and much more acceptable.

- C