Google Video Quality Report
Good. I swear youtube is throttled by Time Warner Cable for me. I stream Netflix, Hulu, etc and never have problems with them. I can confirm that I'm getting my speeds of 20MBit/s down, and yet almost every video on YouTube buffers. If I use youtube-dl to download the video, I can confirm that my actual connection speed is somewhere around 60KB/s. If I then use youtube-dl on my VPS with the same video, I get somewhere between 2MB/s and 8MB/s.