Doing a Page Defrag once in a while may help to improve performance on a
Windows XP based PC. Here's some information about a free utility that can
do a Page Defrag in Windows XP.
For more details about the PageDefrag utility and to download it from
Microsoft, click on the following link:
http://technet.microsoft.com/en-ca/sysinternals/bb897426.aspx
The following information was excerpted from Wikipedia regarding PageDefrag:
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PageDefrag is a program, developed by Sysinternals (now distributed by
Microsoft), for Microsoft Windows that runs at start-up to defrag the
virtual memory page file and the Registry files.
If these files are defragmented, this may improve performance. Since
PageDefrag only affects a small number of files, it takes a relatively short
time to run when compared to entire-disk defragmenters like Windows Defrag,
so long as the page file is not fragmented. If the page file is fragmented,
PageDefrag can take as long as Windows Defrag, or even longer.
PageDefrag does not defragment the contents of the Registry files, only the
placement of these files on the hard drive.