Incredible as it seems, windows is designed to have a 0.4 second delay before opening menus. If you want snappier response in Windows, you can edit the registry to get rid of this delay.

To start this process, run regedit. In the left pane of the regedit window, navigate to HKEY_CURRENT_USER + Control Panel + Click on Desktop and then look for the MenuShowDisplay parameter in the right-hand pane. Double click on this entry and you can edit the value of this delay. The default is 400 (that's milliseconds, 0.4 seconds). You can reduce this all the way down to 0 to get faster opening menus. You'll be surprised how much faster Windows feels when you make this change.