Cause of delay at beginning of slide when playing on LMS?

Hi, heroes:

So I uploaded my course onto the Cornerstone LMS, and on some of the slides (generally the longer ones (3 to 4 minutes), but not always) there is a few seconds' delay before it starts to play. This happens more frequently after a single question quizzmaker quiz.

And occasionally, a slide even freezes up, though I can get it to unfreeze by hitting the backward button and then moving forward. Then the slide plays beautifully, as if to say "what me? I wasn't doing anything wrong"?

The course contains about 115 slides and 1.75 hours of audio, if that makes any difference.

Any advice on how to minimize these delays are greatly appreciated. Thanks so much, Daniel  

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