Specs:
Intel Core 2 Duo E6600 @3.2GHz
6GB RAM
Nvidia GTX 470 (Display Driver 306.02)
I can play the game with 25-30fps (30fps limit on, 60 fps limit or unlimited provokes noticeable fps drops) when I turn off reflections and shadows completely, otherwise I normally get performance drops to less than 20 fps. On the other hand I can’t play in large PVP because the frames will drop to 1-5 fps when many people are nearby, no matter if game graphics options are at minimum or max.