Windows XP - Modifying and Disabling Prefetch Settings

 

Overview: When an XP workstation boots, XP “prefetches” portions of the files you use most frequently and has any application you've recently run waiting and ready to go. These files can be found in C:\windows\prefetch.

Prefetch behavior can be altered by editing the registry. For low-memory systems, you can even completely disable the feature, which ensures that every last byte of RAM goes toward running current programs, not the ones XP guesses you'll need next.

To change the registry settings for prefetching, use the following instructions.

1. Start REGEDIT.
2. Go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management\PrefetchParameters.
3. In the right pane, double-click on EnablePrefetcher. Use the values below to determine how prefetch will work on your system:

0 Disable
1 Application Launch Prefetch
Boot Prefetch
3 Prefetch everything


4. As a general rule, if you're on a low-memory workstation, 128 MB or so set the value to 0. If your workstation has 512 MB of RAM or more, set it to 3. Otherwise, you can choose the value as best suits your needs and observations.

Richard G. White
RichardGWhite.com

 

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Richard G. White, 2007