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Nope, it's YT, and I believe it has to do with the technology they use for their videos. HN doesn't throttle websites. They only throttle your speed when you go over your data allowance.
Yeah I think you're right it has to do with youtube, because I tried downloading from another website and it was continuous AND much faster. So the question is, is that Youtube's fault, or Hughesnet throttling certain websites.