Yes, reading other articles, record in MP3 outside Presenter
and then import the MP3 audio. MP3 audio is already compressed and
Presenter may add a little more compression.
I would also try to optimise other bits and pieces in the
PPT, like having the same font rather than all different ones and
optimising image qualitly, lessen the qualitly of your back ground
images.
The other option is a hassel but an option, have 2 PPT files,
one high res and one low res.
Remember that Breeze does stream to internet connections. The
end result of the user being able to play the Presentation will be
the same regardless of the internet connection. Internet speed is
only about the speed of whihc it can download.