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Administrative Tools from Start button is slow response
It took almost 10 seconds to collapse the submenus, and when it has, highlighted submenus can't keep up in following the mouse hover. I can even capture it with Snipping Tool before it has the chance to respond.
It's not like that the last time I check, until this morning. While the Favorites is still doing fine.
You might also uncheck the items in the yellow tip box (step 5) in the Visual Effects turorial below to see if that may help some. These visual effects can sometimes delay the menu from opening and closing a bit.