ever watched the HDD LED staying lit the whole time you play CIV4. it seems to run there more than from the ram>i have 750mb ram and civ4 has never used more than 500mb a game, so it shouldnt be using the page file. so it would seem to get a better preformance if you had a fast HDD. ive got a s**t hot pc and it struggles to play civ4 even with all the graphic options set to medium (i play huge maps!) but by the time you discover sattalites the game lags. ive tried various things to improve the preformance with no avial, so i think the anwser is a faster hardisk, i think mines 7800 surely faster than this would be available, maybe a super ata drive!