my app on applestore with AIR 3.2

my app http://softeoscar.altervista.org/2012/03/conta-le-pecore-per-iphone/?preview=true&preview_id=2092&preview_nonce=4f2fe4061d with the video

if you want same promo code ask to me from this discussion.

I remember that this app is more smooth on 3gs than 4, also whether the imgages are the same, that is they have done for 320x480 screen display. I'm doing the 4 version, with images to 640x960 screen display but it isn't into applestore now.

do you know how can I to do for improve the smooth on 4? I will try with the "direct" (changing it from cpu) into the manifest, but I don't use Stage3D, I use stage.

The strange is that every 4-5 levels the game slows, independently on sprite are on the screen, while on 3gs when the sprite up a number then the game slows, so these is a constant, that is the number sprite on the screen... In the 4 I don't understand why every 4-5 levels I look this situation...