As you cruise throught NT menus, NT has a default delay of 400msecs before it pops up the submenu. If you want snappy submenus, reduce the delay. To modify the delay, cut and paste the following code into menusnap.reg file and run it.

REGEDIT4
BLANK LINE GOES HERE
[HKEY_CURRENT_USER\Control Panel\Desktop]
"MenuShowDelay"="100"
BLANK LINE GOES HERE

Experiment with the delay to see what fits your comfort level. See .REG files for background information on .REG files.