I've made a couple very simple animations to be used in an iBook, and they are just not smooth. My only guess is that the image quality is too high. But I cut the quality in half and the problem still occurs. The animation is 2 photos move toward eachother, fade, and a third photo fades in.That's all.
The dimensions of the three photos:
-128KB - 1020 x 788
- 316KB - 1768 x 2216
- 291KB - 1881 x 2521
The Stage is 1354 x 985
It's designed for an ipad.
It's likely the dimensions of your images. The iPad is optimized for 1024x768, so images (and stages) larger than that will start thrashing the memory, which will in turn cause playback problems. Hope that helps,