Windows Vista SuperFetch enables programs and files to load much faster than they would on Windows XP–based PCs. When you're not actively using your computer, background tasks—including automatic backup programs and antivirus scans—run when they will least disturb you. These background tasks can take up system memory space that your programs had been using. On Windows XP–based PCs, this can slow progress to a crawl when you attempt to resume work. SuperFetch monitors which applications you use the most and preloads these into your system memory so they'll be ready when you need them. Windows Vista also runs background programs, like disk defragmenting and Windows Defender, at low priority so that they can do their job but your work always comes first. This makes launching of those applications much faster, but it might be an unwanted behaviour for system tweakers or gamers. There's no hard evidence that enabling or disabling this service will increase performance in general, but if you open and close applications often you should definitely leave it alone. You will have to test your configuration to know for sure. Note: It's not recommended to disable this service, but let's try to do everything on Vista. Open up Services in Control Panel or by typing services.msc into the Start menu search or run boxes. Double-click on Superfetch in the list to open up the properties, and then change the drop-down to "Disabled". You can also click Stop to immediately turn it off. It's not recommended for regular users, but some gamers/performance addicts might find it useful.