Minimize Menu Loading Delay Time Through A Registry Hack

By default, both XP and Vista wait 400 milliseconds before presenting expansion menus (those menu items with right-facing triangles on them). You can eliminate the wait completely for instantaneous menu expansion (though be warned, you may not actually like it). Note that this will not make, say, your primary File or Edit menu show up faster—those menus automatically load as fast as possible.

Run regedit at the Run prompt. Browse to HKEY_CURRENT_USER\Desktop. Double-click the MenuShowDelay key in the right-hand pane and set the value to 0.