i've learned a few things after upgrading to a dual core cpu but this game has been driving me nuts. when i first played it worked fine on high graphics and 4xAA, after 8 hours of non stop playing it started going slow. then i would restart the game and it would play for like 5 mins then start going slow again, lowered the graphics, it went up to 2 mins of game time then sluggish stuff. after restarting a few times and trying again and again, it stayed for a while but once i minimized, it lags. i'm thinking either it's my cpu or my ram or that nvidia shader thing but i doubt it's any of my hardware since i've tried different parts and after it lags and i try to play another high end game i get over 100fps with no lag what so ever. could it be because i'm using 64 bit? i'm gonna buy the ddr437 crosair ram soon for overclocking and stuff so i'll soon find out if it's my cheap ram. if any one can link me to a guide on how to change the vertex shaders i'll be happy till i get this thing fixed :3