The Menu Control unfortunately is known to run slow. Look how costly it is in bandwidth if you had a million users a day! View source and look at those 3 pages of code it puts out. This is why I created my own Menu Control. You are better off to write your own script on htis one. If you dont need the menu items to be dynamically loaded than use a dhtml menu. Rememeber, .net controls were invented for quick web solutions not the best.
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Best Regards,
Ryan