If I had to guess about that particular problem, and having into account that Flash animation make heavy use of vector graphics, I think the problem for the sluggish Flash playback is due more to CPU problems than anything else. The CPU on the Clix (albeit faster than the U10) seems to not be quite powerful enough for some "heavy" animations. I'm unfamiliar with the ARM architecture, so I'm not sure where to point the fingers at (the hardware, or the firmware not being optimized enough... though that's hardly it, as mostly firmware is written in assembly).