Air - poor performance on Android. is Starling a solution?

Hi,

I develop an endless running game for android with flash pro cs6 and AIR 3.2 for Android. Since the game is very simple, I cannot run at 60fps.

The game has a static background(180x240px), a scrolling floor and 4(max 6) obstacles 32x32px at a time on stage.

The stage objects are scaled up by an integer factor to full fill the screen resolution like that:

bitmap.cacheAsBitmap = true;
bitmap.cacheAsBitmapMatrix = new Matrix(multiplier, 0, 0, multiplier);
bitmap.scaleX = multiplier;bitmap.scaleY = multiplier;

The app is set to work in gpu mode. Any framerate under 60 looks unsmooth.

Is there something else to do in order to gain few more fps? Can I get a better performance using Starling?

Thank you

PS. When is have no animations on screen, the fps hits 60.