During Windows XP installation, Setup queries the system processor to determine the size of the Level 2 cache. However, it doesn't always succeed. When this happens, Setup configures a default setting of 256 KB in the registry.
If your computer has a larger Level 2 cache than Setup configured in the registry, your system won't perform optimally. To significantly increase the performance of your system, change the value in the registry to match your Level 2 cache.
Level 2 cache Value Data setting
256 KB 0
512 KB 200
1024 KB 400
You may need to restart the system or log out of Windows XP for the change to take effect.
If you're not sure of the actual size of your system's Level 2 cache, copy this script and save it as L2Cache.vbs:
Set ProSet =
For each Pro in ProSet
WScript.Echo "Level 2 Cache:" & " " & Pro.L2CacheSize & " KB"
Double-click the script to run it, and you'll see a dialog box that displays the size of your system's Level 2 cache.
Note: Editing the registry is risky, so be sure you have a verified backup before making any changes.