Why do online videos lag, drag and choke?

First there are two types of videos: One you download and -more commonly- streaming videos.

Streaming videos that are not expertly prepared for the internet do not play smoothly -or choke- and disrupt the viewer experience.

If you are watching a video online that lags more than a second or two, studies show you won't watch that video in its entirety.

Video players that drag and choke are not effective promotional tools for your destination.