User blog comment:Brandon Rhea/Making Ads Better: The Basics/@comment-25356303-20170116191035/@comment-20644-20170116192003

I can get you a more concrete answer tomorrow (our US offices are closed today), but my guess would be that the issue at play in your example is the number of ads in general, rather than just a bandwidth issue specific to video ads. Meaning, if the number of ads on the page was reduced, that issue would probably be significantly mitigated.