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ValveTime.co.uk | Valve News, Forums, Steam
The Inquirer claims that the promised speed increase in Longhorn can be enabled in Windows XP as well. To do this, open your Registry (Start>Run>Regedit) and go to:
Create a new DWORD underneath that key called EnableSuperfetch and give it a value of 1. I don't notice any performance increase, but I thought I'd pass this on to you - it can't hurt to try it. http://www.tweakguides.com/