peterdaly - 8:45 pm on Feb 1, 2010 (gmt 0)
On my first generation 1.5ghz Mac Mini, the speed of the entire UI is directly related to the number and size of flash elements currently loaded and running. More flash = noticeably slower UI...scrolling, etc.
At least on the Mac, flash is a huge resource hog. I don't think the iPad/iPhone/iPod devices can run it effectively with their limited resources.