nobody is slowing your machine. my MB12 is faster with every update.Next step is never allowing non App Store apps.
So, what we have here is a company that slows down older iPhones that makes it impossible to skip updates on Macs. So far I trust them with my privacy, not with their tricks to slow down your hardware and make you buy new hardware.
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This is best macOS version. Much better than Mojave.It's more like macOS Me.