Click on the Vista Start icon and type in regedit in the search field. You can also use the RUN Command provided it has been enabled. Press Enter.
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This opens the Registry Editor. Where you will see the various registry folders in the upper left side as shown below.
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From here we need to expand HKEY_CURRENT_USER \ Control Panel \ Click on Desktop
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This opens several values in the left panel. We want to Double click on "MenuShowDelay".
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After double clicking "MenuShowDelay" you will get the following Edit String window which should have a default value of 400. Delete that and change it to 0. Click OK and exit out of the Registry Editor.
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That is it! Now the Start menu will launch much faster!