Increasing the Folder Cache

The default setting for WindowsXP is to cache the Explorer settings for 400 folders.
To increase it:

1.Start Regedit

2.Go to HKEY_CURRENT_USER\Software\Microsoft\Windows\ShellNoRoam

3.Change the vaule of BagMRU to whatever size you want (hex)

1000 - 3e8

2000 - 7d0

3000 - bb8

4000 - fa0

5000 - 1388

You can copy reg file that will set it for 5000
REGEDIT4

[HKEY_CURRENT_USER\Software\Microsoft\Windows\ShellNoRoam]

"BagMRU Size"=dword:00001388