Level 1

8 points

Catalina/Big Sur is too slow.

Hi. I updated from Catalina to Big Sur and my Mac became ridiculously slow. Reseting SMC/NVRAM/PRAM didn't help. I wiped it out and installed Catalina again. A couple of days later OS started to get slow again. Sudden and quite long spikes in CPU usage up to 90% make it impossible to work. Any help?

Here's current EtreCheckPro report:

EtreCheckPro Report

MacBook Pro 15″, macOS 10.15

Posted on May 9, 2021 3:00 AM

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3 replies

Level 10

84,018 points

May 9, 2021 3:58 AM in response to noirboi

As a test remove CleanMYMac app according to developer's instructions temporarily and test.

https://cleanmymac.com/how-to-uninstall-cleanmymac

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Level 10

84,018 points

May 9, 2021 5:19 AM in response to noirboi

If you find your Mac is running slowly, there are a number of potential causes that you can check.

https://support.apple.com/guide/mac-help/if-your-mac-runs-slowly-mchlp1731/mac

Repair a storage device in Disk Utility on Mac

https://support.apple.com/guide/disk-utility/repair-a-storage-device-dskutl1040/mac

Reset SMC: https://support.apple.com/en-us/HT201295 Choose the appropriate method.

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Level 1

8 points

May 9, 2021 4:19 AM in response to dominic23

Thanks for the advice but I installed it after it got slow, not before. I'm pretty sure it's not a problem here.

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Catalina/Big Sur is too slow.

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