Presentation slower with 2nd display

I've created a presentation with audio. The timing of each slide is fixed so there's no manual advance. When I play it only on my laptop, the timing works out just fine. When I hook up the external display (either a monitor or a projector) and use the presenter mode, the song ends 7-10 seconds before the slides and there is occasionally a stutter in the soundtrack. If I turn off the presenter mode the soundtrack plays fine, but it still ends early.
Does that sound like a memory problem? My iBook has 768MB, the video card is 32MB I think. The minimum specs for iWork '08 is 512MB and 32MB.
Any other ideas?

Did you create the original presentation on the laptop or on your desktop machine?
The duration of all Builds and Transitions is dependent on the processor speed of the computer doing the playback. It sounds to me like your laptop "slows down" when driving the external display. I think that the only way to correct this will be to readjust the Build and/or Transition timings on the laptop while the external display is connected and operating.

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