Judging by the video posted by Megacrazy (I don't have a handset ): 1. Go to a page that's quite large, plenty of scrolling and complex layout. 2. Zoom in. 3. Scroll at high speed up and down. 4. Observe drop-outs where the rendering doesn't keep up with the scrolling. If you can't find any I say we have a winner :-) If it happens on some sites but not others of equal apparent complexity, I say we have a computer science problem that is fun to solve :-) It it happens with lots of sites, that'd be a bit sad.