When using the start menu the you will notice a delay between different tiers opening. This will allow the different tiers to appear instantly.

1. Start Regedit. (START/RUN/TYPE: regidit)
2. Navigate to HKEY_CURRENT_USER\Control Panel\Desktop
3. Select MenuShowDelay from the list on the right.
4. Right click on it and select Modify.
5. Change the value to 0
6. Reboot your computer.

Note: A setting of zero (0) is virtually instantaneous - experiment with other settings (200 or 300 or 400 perhaps) to see what you are most comfortable with.