I suspect it has to do with all the thumbnails which are worthless to me (I wish I could turn them off)...but I have about 800 movies ripped in my iTunes library. When I am scrolling through my choices under the sync options to add movies or remove them from my device, the scrolling is painfully laggy even on Vista x64 with 4.26GHz dual core, 4GB overclocked RAM, etc.

In addition I'm trying to figure out how to get movies that I have changed to the type "tv show" instead of movie to show up under the TV Show tab, but that doesn't seem to be working either.