Here is another registry hack that you can increase the Windows XP start menu loading time. This registry tweak may also be applied to Windows Vista and Windows 7.
Normally Windows takes a little time lag before jumping to menus and sub menus. But we can reduce this time lag and increase the Start Menu Showing time by modifying the registry entry.
This is the method to follow:
Click on Start > Run > then type regedit and hit Enter to open Registry Editor.
Expand the menus in Registry Editor as follows :
My Computer > HKEY_CURRENT_USER > Control Panel > Then Click on Desktop .
After click on Desktop, on the right side search for the key 'MenuShowDelay' Double click on it to modify the entry and change the value to '0'. After you done close the Registry editor and Restart Computer.
After restart of computer you can see the faster display of Start menu and other program menus.