Sent to you by Chris Hunter via Google Reader:
Windows uses a page file to store data that can't be held by your computer's random-access memory when it fills up. While you can tweak the page file settings, Windows can manage the page file fine on its own.
The Windows page file is somewhat misunderstood. People see it as the cause of slowdowns because it's slower to use the page file than your computer's RAM, but having a page file is better than not having one.
Image Credit: Blake Patterson on Flickr
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