I have a menu that is rotating and because of that when i play the movie the cpu usage reaches almost 100%.
The movie has 7 buttons (circle sections) and on the over frame of every button is a movieclip. All is rotating (tween motion rotate: CW)
No AS.
Please help 
Try enabling bitmap caching for some of the content.
You can also substitute simple rectangular filled backgrounds for complex transparency masks.
ie: a complex logo with transparent background placed over a solid colored background, does not actually need a transparency mask.
Vectors require more CPU cycles, but are small in filesize.
Rasters consume memory and bandwidth, but execute smoothly and quickly within fewer CPU cycles.
Keep in mind that Flash Player will take as much CPU as it can get to help it render your content. You may just need to do less. Reducing size and frame rate can help, along with snickelfritz’s suggestions.
