im kinda expecting this to get deleted, but oh well.
Performance: Ive personally had better performance on Monterey than: mountain lion, Sierra and Catalina. This is more than likely gonna be the case for every version, since they are simply more optimized Keep in mind I have a mid-2012 15" MacBook Pro.
"It runs terribly, what do I do!?!!?", try running post-install, it will fetch stuff like drivers, which can be crucial for remotely good performance.
"what if something goes wrong??" on startup, hold command and/or option + r to enter recovery, from here, you can reinstall the version of macOS that came with your system.
"how do I do this without usb??" set the smbios to advanced, then select any spoof model, then, fully install open-core and ignore the reboot. Now, download the installer. make a 16-gb partition of any disk and name it "MyVolume" with the format "OS X Extended (Journaled)", next, open terminal and paste the following:
sudo /Applications/Install\ macOS\ OS.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume
now, replace "OS" in "OS.app" with the version of macOS your installing (e.g. Monterey), and if it has a space, do it like Big\ Sur, now, press enter. Restart your machine, then hold down option/alt, now, enter the EFI boot that has the open core logo. Then, click on "Install macOS ___" now, its pretty straight forward, in fact so straight forward you can do it without any help. Once your in the os, open open core, then click "post-install root patch".
If you have any other questions, leave them in the replies, I will help.
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