When mousing over the top menu bar, from group to group, the category/sub category/page literal changes immediately. This is appropriate as a default for pcs that have a movement device and visible cursor. When using smart phones and tablets the situation is not quite the same. It seems that it would be more appropriate on the smaller less capable devices to introduce a delay before changing from one menu item to another, allowing the using a little more time to choose subcategories or page entries without being virtuoso with his/her fingertips. If the intent is not clear please let me know I will expand on my proposal.