A simple registry tweak will allow you to speed up the menu. First load the registry editor by launching regedit from the Run menu (Press WINDOWS KEY + R to access the run menu):
Then, navigate to HKEY_CURRENT_USER\Control Panel\Desktop in the side panel, then right click on MenuShowDelay and select Modify:
Now, enter the menu delay time in milliseconds (1 is near instant, do not enter 0!) and press OK:
Once you have restarted your menus will slide at near instant speeds. The default setting is 400 should you wish to restore the default menu setting.