In the DVD Lobby TV interface, if you select a genre or "first letter" then click Left Arrow (which wraps around to the end of the list), the interface takes awhile to respond. (It looks like it is scrolling through the entire list behind the scenes caching all the thumbnails as it goes rather than just showing the end of the list).
It would be awesome if the list were smart enough to either handle a jump to the end. (If I know the title I'm looking for is toward the end, I hit left without thinking and then end up waiting for the list to populate. For the "All Movies" selection, this can be a long wait.)