Michaël Chaize, Adobe Flash Platform Evangelist, compared Flash Player 10.1 to HTML5 on PC’s, on Mac and Google Phone and came to the conclusion that Flash Player 10.1 is optimized  and also much faster.

” [...]for every technology that deals with animation, you need to take care of performances and code optimization. The Flash Player 10.1 runtime has been optimized by the Flash PLayer team for mobile devices.”

Check out the video below and the resources Michaël recommends in order to get the tips and tricks that can optimize the rendering of your animation, the CPU and Memory consumptions.