From:
http://www.dealtime.com/xPR-Windows_XP_Professional_Upgrade_with_SP2_E85_02666~RD-195230142084
Tips for New Users of Windows XP: Performing a minor tweaking on Windows XP for increase responsiveness.
Windows XP (SP-1 or SP-2) is poor at system resource management; or, perhaps it is too stingy with the way it "uses" resources. In a fresh install of Windows XP, a paging file (swap file) can be at least 530MB and as large as 3100MB depending on how much RAM is available. The way Windows XP prepares its paging file size is based on the amount of physical RAM; and it assigns a minimum of 1.5x physical RAM and a maximum of 3x. On my workstation with 1024MB RAM, Windows XP assigns paging file with a range of 1536MB to 3072MB. This is bad, because the system spends so much time using hard drive for its virtual memory, while the capable physical RAMs sit and do nothing. Even worse, the paging file resides on the system partition, thus further slowing down the system responsiveness because the hard drive is so busy reading/writing bits of files to and from various sectors in the hard drive.
For a multiple hard drive, the advantage is to set a system paging file on a separate disk (spreading out on several disk even better) out side of the system's drive. If you have large RAM, 720MB or 1024MB, it's good to reduce the paging file and "force" Windows XP to use physical RAM. For my desktop with 1024MB RAM, I set paging file split into two parts on two separate disks each with a range of 32-512MB. The system was very responsive. For a desktop with 2048MB RAM, I set two separate paging files each with 32-256MB. Of course, the advantage of using a separate paging file only works with a desktop system with multiple disks. However, for a laptop, the same procedure can be done if it has a good amount of RAM (say 512MB or larger). Reducing the paging file to about 480MB on a 512MB RAM system should also improve the system responsiveness. Sometimes, if Windows complains about low virtual memory, you can increase the paging file, especially with many large applications running.
Moving My Documents, My Music, My Pictures, etc., out of the system partition (preferably on a separate disk) is another good way to increase Wndows XP responsiveness.
After a long use, the paging file becomes very disorganized with fragmented files much like normal data partition; and this can really slow down the system. Performing a disk defragmenter only "defragments" data sectors. Windows XP does not touch paging file section, because it is constantly using it. The advantage of multiple disks is to move the paging file around while performing a system wide disk defragmentation on each drive or partition. This is where the advantage comes in with the use of several partitions even on a single hard drive.