Speed up Menu Show Delay in Windows 7
This will show you how to change the amount of time it takes for a menu in Windows 7 to pop, fade, or slide open when you run the mouse pointer over it. The Fade or slide menus into view and Fade out menu items after clicking Visual Effects optiond will also affect how fast menus open and close. Unchecking these options will help speed it up in addition to doing the steps in this tutorial below.
This hack is through the registry
Open the Start Menu.
In the search box, type regedit and press Enter.
In regedit, go to HKEY_CURRENT_USER\Control Panel\desktop
In the right pane, right click on MenuShowDelay and click on Modify.
Type in a number between 50 to 4000 for how many milliseconds you want the Menu to wait before it opens. The lower the number, the faster the response time.
Click on OK to apply.
Close regedit.
Log off and log on, or restart the computer to apply the changes.