Help.. 3D rotation (rotationY) slow as hell on iPhone (AIR) high definition

HELP…
It is just a simple rotationY I am doing…
mFlipAnimation = new Tween(this, “rotationY”, Linear.easeIn, this.rotationY, 90, 40, false);

It even performs ok in low resolution export;
but under high resolution export the speed is SUPER SLOW!!

I have tried cache as bitmap matrix,
this.cacheAsBitmapMatrix = new Matrix(); //< only available for AIR
this.cacheAsBitmap = true;

Only later I found the caching don’t really support 3D rotations…

Is there anyway to get it perform normally under high res??

Thanks!!