macOS Sierra CalNCService high CPU usage

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    Don Rowlands

    I'm not a mac expert by any means, but after doing what you said up to the cal internet sync part I noticed that cpu was still running at 100% (+!). I then disabled Google calendar sync in internet accounts, the %age CPU showing in top dropped off immediately.  As I don't need it sync'd with my mac calendar, I'm more than happy to leave it that way.  Thanks for the pointer!

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    Ned

    For me, it was a specific reminder causing the issue. I clicked done, and the CPU usage dropped off a few seconds later.

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    Sean V

    For me, both CalNCService and accountsd were running hot. Disabling Google calendar sync in Internet Accounts did the trick. I was able to re-enable it a few minutes later without recurrence of the issue. Thanks all for the tips!

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