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Thread: Prefetch

  1. #1
    Member curly's Avatar
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    Default Prefetch

    I have heard many different views on this, should one clear this out or leave as is. Thanks.

  2. #2
    Member Bear's Avatar
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    You can clear it out if you wish but Windows will simply rebuild it. So it's kind of waste of time to clear it out IMHO. See if this helps you.

    Myth - "Deleting the contents of the Prefetch folder improves performance."

    Reality - "Every time you delete an application's Prefetch (.PF) file you will cripple that application's load time the next time you go to launch it. This can temporarily increase load times by as much as 100%. For one thing, XP will just re-create the Prefetch (.PF) trace files anyway; secondly, it trims the files if there's ever more than 128 of them so that it doesn't needlessly consume space. However you do not regain optimal application load times back until after the second time you launch the same application due to the Prefetch (.PF) trace file being re-created. Prefetch (.PF) trace files are not a cache and are not preloaded into memory upon windows startup. They are never even accessed until you launch an application. Only one Prefetch (.PF) trace file per application is created. There is never ANY reason to delete these files. Cleaning the Prefetch folder is actually a temporary self-inflicted unoptimization. Why you would want to deliberately hurt your PC's performance I have no idea."

    Some reading on the subject below.

    http://www.edbott.com/weblog/?p=743

    http://www.edbott.com/weblog/?p=619

    http://blogs.msdn.com/ryanmy/archive...25/421882.aspx

    http://www.edbott.com/weblog/?p=24

    http://djlizard.net/2006/06/02/157

  3. #3
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    Just to add a little to Bear's comments.

    On occasion malware programs may find a nasty in the prefetch files.
    When this happens we recommend that all prefetch files be deleted, but not the folder.

    BG

  4. #4
    Member curly's Avatar
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    Default prefetch

    Thanks to you both for your replies I will do as suggested and leave it alone. Greetings from Australia.