I am currently using Amazon and I noticed that when you mouse over a dropdown menu (e.g. "Shop by department" or "Your Account"), there is a slight delay before it brings up the menu. Most other websites with these menus load up instantly, so I am wondering why they chose to have a delay.
Every time I use one of these menus, I always end up clicking the menus (because of this delay I think), which brings me to an overview page.
Is this delay even needed? Is it a bad user experience having this delay?