How fast or slow submenus appear when your mouse is over a menu, is dependent on
the MenuShowDelay value. For faster fly-out menus,
reduce the delay interval using the following Windows NT / Windows 2000 /
Windows XP registry hack :
Value: 400 ms default
Setting MenuShowDelay too low, can actually hurt performance
if Windows is using too many cycles creating and destroying undesired menus.
This is a personalpreference item. Experiment to see what value works best for
you. I like a fairly low value with zippy flyout menus. I don’t like to navigate
menus under Start in geological time.