Sound in MovieClip Causing Frame Stutter

Has anyone seen this issue or know how to solve it?

I have a main MovieClip playing at 30 fps. At different points in the movie, I need to play a second MovieClip on top of the first as an effect. This effect has a sound in it set to Stream for syncronization. The effects are created dynamically, so they can’t be a part of the main MovieClip. Any of the effects’ audio has to be syncronized with its associated video and each lasts about 15-20 seconds.

The problem is, the entire Flash Player stutters for a few frames each time an effect is played and it ruins the overall effect of the background movie. Pulling the effect’s sound out off its timeline and playing it separately gets rid of this, but then syncronization is lost.

Am I going to have to choose between frame stutter and syncronization, or is there a way to fix this?