Jerky Flash

[MTWK]

http://ingenuitydesigngroup.com/ippiFlash/slideshow.html

Red square is a simple movie clip being tweened across 60 frames. Frame rate is at 20 fps. Any idea why it's so jerky.

[MTWK]

http://ingenuitydesigngroup.com/ippiFlash/slideshow1.html

This one is using an event listener and a timer and it's jerky also. Any ideas?