Does Windows(Vista) get quicker in time?

Superfetch will make the OS feel more responsive, if that's what you mean. It's not really accurate to say it will get faster over time though. To a certain degree it will learn to be slightly more efficient over time but I wouldn't expect it to be really significant. If your computer is running unusually slowly it would suggest a more specific problem.
 
Windows builds up a profile of what applications you run most often, so over time it learns which files to cache into RAM. As theheyes says, it doesn't make anything quicker, as such. Certain applications will be snappier to load as the OS doesn't need to go to the disk for the data. Once an app has loaded it doesn't perform it's task any better than if it wasn't in SuperFetch.
 
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