I’m not entirely sure how I ended up finding this page on YouTube’s site, but I’m always interested in seeing real-world bandwidth tests, and YouTube probably burns up more bandwidth than any other domain on the planet, so they have some rich data from which to draw upon. Make sure you’re logged into YouTube, then check out their historical speed page. The above screenshot shows that I consume YouTube videos at 4.66Mbps average speed; I was surprised to see that the average GB rating, and the global rating, were  low.

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