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I bought a used MacBook Pro 2012. It has a new SSD disk, and I have replaced memory and battery - and I have also reset disk partitions and installed Catalina from a USB stick.

Still the MacOS often freezes. Simple operations lead to the colored wheel mouse pointer. It happens also for operations with no network traffic.

Even when I disabled Spotlight indexing (by adding all of the drive to th exception list), the lagging still happens.

I have also reset PRAM and SMC. And the same problem was with Mojave installed instead of Catalina.

I have also run a hardware analysis (by software), and it reported no problems.

My question is this, what else can I try? What can be the cause of the lagging?

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1 Answer 1

Reset to default
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I solved this. The solution was disabling the setting Put hard disks to sleep when possible in Energy Saver settings.

My Mac had an HDD originally, but now it has an SSD. Don't know if that has anything to do with the problem.

https://support.apple.com/en-hk/HT202824

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