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Over the past few months, I have experienced my MacBook turning on its fans because of high CPU usage. When that happens, I see that a process called remindd is using 100-300% CPU for a long time, usually more than 10 minutes. It seems this process belongs to the reminders app, which I do use, but it doesn't make any sense that the app has such a high CPU usage. This is not a one time thing, it happened at least 5 times in the last few weeks. I usually ended up killing the process or restarting my Mac. Quitting the reminders app does not stop the process.

What can I do to prevent this?

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It may be related to the reminders app constantly syncing:

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Although that opens only more questions than it answers.

I'm using the latest MacBook Pro 16" with MacOS 10.15.4 (19E287)

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    Can you pls include the model of your MBP and the version of macOS on it in your post? Thx. – Alper May 24 at 8:30
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    . @Luca as a hit and trial attempt, turn off iCloud sync of reminders on your Mac & turn it back on. – anki May 24 at 8:30
  • I added some more info to the post. I also tried @ankii's suggestion, until now the the cpu usage was normal, but I'll report back as soon when I encounter the problem again. – Luca Steeb May 24 at 8:51
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What worked for me is to turn off Reminders syncing, reboot, then turn it back on. Assuming you are running Catalina, you would go to:

System Preferences -> Internet Accounts -> iCloud -> Uncheck Reminders

It took a bit for my reminders to sync again, but after that, there were no more issues wiht Reminders app lockup and the remindd run away CPU usage.

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Great answer. My Mac was going crazy this morning and I looked and remindd was the culprit. As soon as that stopped all was relatively normal.

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