Flash, Shaving-game, performance issues

(I re-post my original post here, perhaps it’s a more relevant topic)

Hey, I’ve almost finished making a game where you shave the surface inside the borders.

It’s a bit slow… So I was hoping you could suggest which parts are the most demanding ones, for the shave-part i use CopyPixels and the amount of MovieClips is limited.

So, is it the big backgrounds, the CopyPixels, the amount of child-layers attached, all the bitmaps, anything with the mouse that can be added to smooth things out?

Really, I’m at a loss so please just check it out and hit me with everything you got.

http://jonasjohansson.se/shavegame.swf

Just click “NÄSTA” twice and after that “START”.

Thanks in advance!