Movieclip jittery when audio plays

The playback of sound effects from one of my game object's
movieclips (such as an alien shooting) is causing other game
objects (i.e. the walking hero) to judder in their movement, only
while that audio is playing from the other object.
But when I delete the audio from its layer in the movieclip,
there are no problems.
Any suggestions on what might be happening, and where I might
start to investigate, would be appreciated.
I'm coding on Flash CS3 in AS2 for Flash Player 8. Playing on
Windows XP SP2, on a 2 GHz desktop and 1GHz laptop (the problem
happens on both.)
The CPU is NOT going super high when the problem
happens.

there's your problem, 44KHz, docs recomend 11KHz, they'll
play but they'll slow stuff way down. Change the master down to
11KHz with an audio editor like Audacity, trash the old file,
resave, import new file, and run a SaveAndCompact, that should get
it running better.

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