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Why are macOS updates so slow to install? Do they reinstall the entire system each time?

@angristan By using Mach Microkernel, they reinstall entire system? 😹

@angristan In the past, in some cases, yeah, but often not. I imagine some of the back-end stuff has to do with disabling SIP, verifying checksums and, if I had to further guessing: firmware updates.

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