Disable Prefetch for low memory systems
If your system only has about 256megs of RAM or less, the Windows XP Prefetch can take a lot of this up by preloading programs at boot as well as preloading programs you often use thus sucking away your available RAM.
On my old PC, a Celeron 2.4 Ghz with 256 megs of RAM, I was able to greatly boast my system performance by disabling Prefetch all together.
Note: This tweak worked for this user and their system configuration but disabling prefetch on other systems may have a bad effect as it might free up ram but it also could increase program start up time.
Here's how to disable Prefetch.
1. run "regedit";
2. goto [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management\PrefetchParameters\EnablePrefetcher];
3. Set the value to either 0-Disable.
4. reboot.
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