Hi. Thought I would post this information as it's a good list of performance tweaks that will boost performance in Windows XP.
Windows XP runs a lot of stuff both as services and background programs. Many of these can be "turned off" for a significant performance gain. The simplest thing to do is go into control panel ->System ->advanced->Performance and set XP for performance.
A WORD OF CAUTION!!! Some services are required for other programs so just turn them off by stopping the service. They should restart with a reboot. Any changes you make to the registry are permenant, so BE SURE YOU HAVE A BACKUP OF YOUR REGISTRY!!!! In addition to these tweaks, you should close down everything you can that appears in your system tray. Especially antivirus programs, spam stoppers, etc.
I was able to increase my display overall from a medium low to medium high or high, and also wound up getting rid of the stutter and jerkiness problems for a smooth flight.