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Datapoint: I upgraded a min-2012 MacBook Pro to Monterey using this approach and it performs reasonably well for basic use. I also swapped the hdd for an ssd and maxed the memory to 16gb.

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I did the same (upgrade from Catalina) and had no problems. I only bought an Apple Silicon MacBook because the mid-2012's hinge got too loose to keep the display upright. Yes, the new computer is significantly faster, but I could have lived with the older one. So, three cheers for OCLP!

PS - the mid-2012 is now a backup, so is still useful.

Did you reinstall OS, or it works as upgrade?

I upgraded from Catalina to Big Sur (without formatting), and then used Onyx to clear all the caches on my Mac. It works perfectly. Mac mini 2012, 16gb ram, 512 ssd.

https://www.titanium-software.fr/en/index.html

> Did you reinstall OS, or it works as upgrade?

I reinstalled thr os from clean when I swapped-out the storage, so unfortunately I can't comment on the upgrade path.

The machine periodically prompts me to upgrade to Ventura - which I keep declining as Monterrey is fine for my purposes[1] at the moment - so it's obviously happy to do an upgrade.

[1] Running Visual Studio for Mac to build .net apps for MacOS

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