So I haven't played since Build 183 and a lot of stuff have happened since that. Appears new problems appeard too... I can play fine on a resolution of 1680x1050 on high quality setting. No lag as I start the game and no lag when I run around. But for some reason when I start jumping and biting after marines, minor lag kicks in and it often leaves me dead. After 5 minutes of this, my game suddenly freezes for no reason... I can still open the menu, but everything thing else is frozen. TAB, chat, players, everything.
3.33 (clocked to 3.7 ghz) dual core
4 GB memory