Flash drawing engine leads to lower framerate

Hi guys

I’m having this problem with flash that I have never seen before. I have 6 frames of high res pictures 1600x1200. These pictures are needed to make a zoom out effect of a die.
When the user presses a button, the first of these 6 frames is showed, than the second, third, … on the sixth frame, I start a new animation which rotates the dice in 3D.

I need this 6 frames.

When I run the animation the frame rate is very low and then speeds up. No, it’s not an easing effect because when I run the animation of the 6 frames standalone, the first time the animation shows, the frame rate is very low. After 1 cycle of animation, it shows the animation smoothly.

The only thing I can think of is that the redrawing engine notices that the 6 frames were already rendered and can use those rendered images from its memory.

How do I solve this? Is there a way to preload drawing regions? :s

I already tried compressing the frames to JPEG 30% but it doesn’t change anything.

Thanks in advance.
Arcko D