I saw an interesting article on news feed, which was written by a lead developer on Khan Academy, Ben Kamens.
If you feel a tad delay while using drop down menu, you definitely need to check out this blog post. You should be interested in what he described to reduce the delay and want to test the jQuery library. Basic idea was to modify hover areas of each link that allows users to move a mouse pointer more flexible. Take a look the way Amazon did on its drop-down menu and the way Khan Academy developed.