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If you've already set your game video settings to the bare minimum, check to see if there are any excess services running.

Here are a couple of great links that'll walk you through the whole process.

XP Service decriptions and dependencies can be found at:

[url]http://www.blkviper.com/WinXP/service411.htm[url]

Suggested configurations for tuning internet gateway and gaming systems can be found at:

[url:9abd9]http://www.blkviper.com/WinXP/servicecfg.htm[/url:9abd9]

If you've done this and still have performance issues, try the following:
Choose your network card: [url:9abd9]http://www.tweakdatabase.com/tweakdatabase/tweakdb_display.aspx?id=822&des=Stop%20Jerkey%20Gr aphics[/url:9abd9]
Disable Zip Drives: [url:9abd9]http://www.tweakdatabase.com/tweakdatabase/tweakdb_display.aspx?id=1137&des=Stop%20jerky%20gr aphics.%20The%20alternative%20way.[/url:9abd9]