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I updated a friend’s early 2015 MacBook Air, 8GB RAM, 512GB SSD** to Monterey this week, and it doesn’t feel any slower or faster than 10.13 on this machine.

I did a nuke and pave install with a bootable USB Monterey installer.

How to create a bootable installer for macOS

If you’re downloading/creating your install media with a Mac that doesn’t support Monterey, you can download the installer directly Apple, avoiding the App Store.

macOS 12 Monterey Full Installer Database. Download Directly from Apple! – Mr. Macintosh

Edit: I just noticed your post in another thread re: creating bootable media without DiskMaker X, and installing on partitions. I followed Apple's instructions, and it went smoothly. Use a freshly formatted USB with an unmistakable title, ie: "Untitled", and you should be fine.

I'd be inclined to forgo partitioning, and just make a bootable clone of my High Sierra setup to go back to, if Monterey was a bust.


**I upgraded her drive from stock 128GB to a 512GB M.2 SSD. Zero issues issues so far, and it benchmarks at ~1400 MB/s, reading and writing.
 
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