Interactive 3D Flip- CPU usage ~50%

Question

in the "Interactive 3D Video Flip" tutorial  i take the cod and applied   to my stuff
I noticed that when the page was rotated the  Flash  player  consume  40-50%  from my CPU , how it's possible?  the animation  it's finish  but the CPU it's 40-50% used . tested in mozilla and IE  and  from Flash ( when i  test the movie)    Pentium 4 and athlon 64 X2  tested!!!.. windows 7  last version of flash player 10.045..
caurina  class... ^ transmission tween class  the same   ~50%
i use the cod from this tutorial : http://gotoandlearn.com/play?id=91  with caurina class
and the transitions.Tween from http://www.onenterflash.com/2009/07/adobe-flash-cs4-tutorial-3d-page-flip.html
i don't  have any movie or animation  put in page 1 or page 2  ..nothing animate  just an rectangular  and the rotate button
suggestions ?
i attach the files fla and swf to see   open th .swf  with flash player  and in task manager voila de "surprise" cpu used 50% and the animation do nothing just stay

Answer 1

look at the .swf from attach ... open it.... with flash player.... open task manager.and you will see that the CPU usage 50% for FlashPlayer.exe ( after you pus the rotation button) and  stay tu 40-50% even when the animation it's stop!!!!
yeap i run win 7 and if  i put this interactiv 3d animation in to flash web site with animation..the aplication go very low
just open the .swf ,click the rotation button and in task manager see the CPU usage of FlashPlayer.exe