there is a program available that will help people experiencing issues with the amount of ram available to the game.
http://www.iobit.com/gamebooster.php
the performance of the game is directly affected by the amount of available ram.
the game booster program shuts down unneeded processes and background services, freeing up ram available to the game.
i installed it on my XP rig that only has 3 gigs of available ram and it helped a good deal with the performance.
if you are having performance issues give this a try.














