Slow Rise Animations with Embedded Vimeo Videos

I'm investigating a performance issue with some of our Rise courses. We heavily use embedded vimeo videos in our courses and found that the transition animations in the Rise course are slow/jumpy when we have embedded vimeo videos. Our course that contain just images/text do display the same behavior.

Here is a link to one our courses:

It is a very simple course, one section, with an embedded vimeo video and some text. When clicking the Start Course button, you will see that the normally smooth animation of the cover image is jerky or even skipped enitirely. 

This is happening on all of our courses with embedded vimeo videos. Any ideas?

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