Quote Originally Posted by pezhetairoi
IMHO it also helps if you increase the size of your paging memory file, under Control Panel -> System, advanced. Then set the paging file to something like 1000mb normal size and 2000 max, or whatever number beyond that suits your fancy. The game only needs about 750mb paging size to run, but that's the absolute minimum. Give it more to minimise lag.
Actually the optimal size for a page file is 1.5 times your installed memory. So if you have 2 gigs of memory then your page file should be 3 gigs etc. Setting the page file to anything else is just a waste of resources and won't help performance at all.