Why is it slow to boot up
very slow to boot up and runs slow after installing big sur
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If your computer still has a standard hard drive or fusion drive, I’ve noticed quite a lot of them running very bad on BigSur. I would suggest either replacing the hard drive of the fusion drive with a 2.5 inch SSD or going back to macOS Catalina.
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Where is the hard physically located? I'm having a very hard time disconnecting the cables from the display or the chassis. I have purchased a SSD that I will try to install if I can get there.
@ldonj - follow this guide Substituição do disco rígido do iMac Intel 27" com tela Retina 5K 2019
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Reboot your system and press the D key to enter into diagnostics. Did you get any errors?
Reference: Mac startup key combinations
por Dan