It's because your laptop isn't meant to 'support' an OS 12 years later.
People think forcing Os's on a laptop is a good idea - While yes it saves money, just because you can install it doesn't mean it's going to work efficiently. You're practically Hackintoshing your laptop therefore there's something that's bound to go wrong. In this case, MacOS Monterey requires a certain PPI (pixel per inch) / screen resolution to run perfectly. If I remember correctly, the 2010 to 2013 Unibody Pros has a 720p screen which is nowhere near the minimum requirement for Monterey. I believe it's something along the lines of 1080p or even 4K now. Plus, it probably can't find the right display drivers to run on your laptop as well which can cause that weird ghosting look you have as it cant run as the displays native FPS. Either downgrade to the last MacOS version that you had success with and it ran like butter or just get a new Macbook. I think Apple is supporting BigSur security patches till' 2025 so you should be good.
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Are you able to use the Mid 2012 as a daily driver?! If so I suggest it. Sorry to sound so brutal but it's the truth. Also, knowing Apple, they probably did something to make it incompatible even with a patcher. :D
из userb43221
Best to jump to the Mr Macintosh site to see if they can help you. This is clearly a video driver issue. We can't offer you any help unless you see this issue within the proper OS release for this system.
While I would love for Apple to offer support for the older systems there are limits from a hardware perspective.
из Dan