I don't have problems like this. However other people have had issues like that and they sorted it out by updating their latest graphics card drivers.
Some have also suggested that removing some of the Widget Manager(s) increases the performance speed of scrolling through the menu.
Try first updating your latest graphics drivers if that doesn't help then removing some of your widgets there's a small circular icon with a rectangle on the top in main menu, click on it and tick off various widgets that are not important to you. This should effectively eliminate slowdowns in main menu!
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