Videos slow to load for learners

I have a Rise 360 elearning with 3 videos uploaded directly. They take forever to load/play (both when I preview and when sending out to others for review). They are each approx 25 MB, so not massive. About 2 mins long. 

This needs to be sent out ASAP. Any thoughts or ideas on why they are taking so long to load? Anything I can do to quickly fix this? 

Thank you!