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2
  • Seems likely to be something silly with your Anker USB 3 GbE dongle. I've never seen CPU usage like that with my Apple Thunderbolt GbE dongle.
    – Spiff
    Commented Aug 16, 2017 at 3:38
  • Thanks! I'll try picking up a different adapter. The only Mac I have with gigabit ethernet built in is a 2003 PowerBook which doesn't have the issue so I wasn't sure :)
    – lungj
    Commented Aug 16, 2017 at 3:57