Does Storyline load progressively?

I am hoping someone will be able to help me out with this.  I am currently going through bandwidth testing with a course that was created using storyline.  IT is telling me that unlike other courses it tests all of the data is being sent at once instead of queuing up 2 to 3 "slides" ahead.  Is there a setting I need to tweak in order to allow this to happen?  Also it contains video that was imported in mp4 format.  Would converting to .flv make a difference?  Any help would be greatly appreciated!

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