Wow, found your plugin, and thought, GREAT!, a simple, minimal plugin that does exactly what I want.

Well, unfortunately, there is an issue. When a page is loaded, this plugin has a bug that first displays the entire menu in an “OPEN” format and then closes it. It slows down load time and creates an unsightly jump on my pages.

http://wordpress.org/extend/plugins/optimized-dropdown-menus/