Very frequently when I am downloading a file, I notice that it downloads very slowly on Safari. This occurs from just about any website I am downloading a file from. However, after a restart of the download (canceling and then restarting it), the download starts and resumes at full speed.

This has occurred to me on macOS High Sierra, and now occurs to me on macOS Mojave.

Is there any reason Safari does this? The only extension I have enabled is uBlock Origin.

  • When you disable uBlock does this still happen? – fsb Aug 15 '18 at 13:28
  • Good question. I'll have to test that out. – Skeleton Bow Aug 15 '18 at 13:32
  • After restarting the download, is it faster throughout or only in the beginning? If it is only faster in the beginning it could be caused by caching. – 11684 Aug 15 '18 at 13:44
  • It's faster through the whole download. It's rather odd behavior – Skeleton Bow Aug 15 '18 at 13:47
  • 1
    Yah, that does not sound like ISP packet shaping (filetering) Turn off extensions and try another browser. You could also reset Safari to defaults, but save your bookmarks first. – Steve Chambers Aug 15 '18 at 17:22

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