Win XP Registry Hack

Menu Speed
Place Windows Kernel into RAM
Alter Prefetch Parameters
Disable 8.3 Name Creation in NTFS

Menu Speed
Go to the Registry key HKEY_CURRENT_USER\Control Panel\Desktop\MenuShowDelay. The default value is 400. Set it to 0 to remove the delay completely, but if you do that it will be nearly impossible to move the mouse fast enough not to activate All Programs if you mouse over it en route to your final selection. Pick a number that suits your style, make the change, and then test it until you find a good compromise between speed and usability.

Place Windows Kernel into RAM
It’s a given that anything that runs in RAM will be faster than an item that has to access the hard drive and virtual memory. Rather than have the kernel that is the foundation of XP using the slower Paging Executive functions, use this hack to create and set the DisablePagingExecutive DWORD to a value of 1.

Edit the Registry key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management\DisablePagingExecutive to 1 to disable paging and have the kernel run in RAM

Perform this hack only if the system has 256MB or more of installed RAM!

Alter Prefetch Parameters
Prefetching (the reading of system boot files into a cache for faster loading) is a commonly overlooked component that can have a significant impact on system boot time. This tweak allows you to select which components will make use of the prefetch parameters. To see which files are gathered using each setting, clear the prefetch cache located at C:\Windows\Prefetch and then enable one of the settings listed in this hack. Clear the cache and repeat
for each setting.
Set the Registry key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management\PrefetchParameters\EnablePrefetcher to 0 to disable prefetching, 1 to prefetch application launch files, 2 to prefetch boot files, or 3 to prefetch as many files as possible.

Disable 8.3 Name Creation in NTFS
Files that use the 8.3 naming convention can degrade NTFS drive performance.
Unless you have a good reason for keeping the 8.3 naming convention intact (such as if you’re using 16-bit programs), a performance gain can be achieved by disabling it.

Set the Registry DWORD key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\FileSystem\NtfsDisable8dot3NameCreation to 1. Exit the Registry
and reboot.