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Superfetch is a service built-in Vista and Windows 7 that prioritizes the programs you're currently using over backround tasks and adapts to the way you work by tracking the programs you use most often. It then stores all your mostly used programs in memory. Basically what Superfetch does is that it speeds up your frequently used programs' startup for easier access. It is indeed a useful feature, but disabling it can help free your memory if you have a slower CPU.

*I only recommend disabling it if you have low memory or a really slow CPU
*I personally like to disable it only when I'm about to run a PC game (Increases FPS by 3)

Here's how to disable it:

1. Navigate to Start, Run and type Services.msc
2. In the list, find the entry called Superfetch
3. Double-click it, select Stop, then hit Disable

Hope this helps!

TechWiz