Movie slowing over time?

The movie in question has certain tweens that are repeated as a transition between sections of the movie. They are slowing down over time even though the frames were copied from the original tweens and only the color properties changed. During the last two sections of the movie,almost everthing seems to be getting sluggish. The whole thing is built using basic tweening animation. I have yet to determine the problem. Any help would be greatly appreciated. The slowing is apparent to me in both the web version and the projector versions.

web version here: note the horizontal color bars and how their animation slows from section to section…