When we embed an MP4 video in a Favro card, other people in the organization have a hard time viewing it because it takes an extremely long time to buffer and display. If they attempt to download the video, that download also is very slow. This is true for videos of all sizes, ranging from 5-100 megabytes. No matter the video size, we often have to wait for long stretches of time (sometimes minutes) before the video will play fully.
This is true for our team members around the world, so it's not an issue with anyone's particular internet speeds.