Function Key : F8

Function key used to enter the Windows startup menu, commonly use to get into Windows Safe Mode.

Juts speed up Startup menu

Juts speed up Startup menu -

Open registry edit and go to this location.

HKEY_CURRENT_USER\Control Panel\Desktop

On the right side Double click on MenuShowDeley and change default 400 to 0.

Now you will see the speed of your menus opening is increased.