I purchased the game today from Direct2Drive. It lags at seemingly random times, and it also hangs when summoning creatures or bringing up menus, even in town. It doesn't happen all the time and it doesn't crash or freeze, it is simply as if it pauses for a couple of seconds. I read that you should lower particle effects and whatnot but I cannot imagine my system having issue with this. I am not a programmer, but as an experienced gamer, it feels like a memory leak as it gradually got worse as I played.
Specs:
Windows 7 RC1 64-Bit
EVGA x58
Intel Core i7 920
8Gb DDR3
dual raptor HDDs
BFG 285GTX
(But in all fairness it runs much better than I anticipated, seeing the development time and I am enjoying it!)
edit:DXDIAG for my playing display

