Yes if you want to quick when you open start menu, i will give you the tips and trick.
- Just click Start ---> Run ---> and type regedit
- When you see a registry editor, looking for HKEY_CURRENT_USER ---> Control Panel --->Desktop, after tha looking for MenuShowDelay at the right panel and double click the change the value data with "0"
- Don't forget to restart your computer to take change effect