Script run slower as movie progress?

I'm making a little plotting Flash. It also calculates some value as it go along. However it gets slower and slower as it go along even if it is plotting the same set of parameters. Anyone encouter this problem before? The flash is located at

http://icenflame.com/collage/equation.html

If you are duplicating mcs as you go along, i could imagine that slowing the works down.

I dupplicate the dot to plot the graph and put it in a new layer. However, it is duplicating the same amount of dot every single run. So there is no reason for the later run to be slower than the first. And it is significantly slower. After about 3-4 set of data it would halt and give the "script causing Flash player to run slowly abort?".

Is there an alternative to plotting beside duplicating dot and put them on seperated layers. The charting component doesn't seem to fit for this task.

Note: the same Flash run perfectly fine on Flash Player 5