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mwfgpwemtb5 Author

Level 1

8 points

Boot Time very long since update to big sur

iMac 27” 5k retina 1t fusion drive now has very slow boot up since upgrade to Big Sur

iMac 27″, macOS 11.2

Posted on May 2, 2021 8:44 PM

Top-ranking reply

Jack-19

Level 8

46,014 points

Posted on May 2, 2021 8:46 PM

Hi mwfgpwemtb5,

Please try;

Reset NVRAM or PRAM on your Mac - Apple Support
How to reset the SMC of your Mac - Apple Support
How to use safe mode on your Mac - Apple Support and then restart into normal mode.

Cheers,

Jack

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2 replies

Top-ranking reply

Jack-19

Level 8

46,014 points

May 2, 2021 8:46 PM in response to mwfgpwemtb5

Hi mwfgpwemtb5,

Please try;

Reset NVRAM or PRAM on your Mac - Apple Support
How to reset the SMC of your Mac - Apple Support
How to use safe mode on your Mac - Apple Support and then restart into normal mode.

Cheers,

Jack

mwfgpwemtb5 Author

Level 1

8 points

May 4, 2021 8:45 PM in response to Jack-19

Hi Jack,

I have tried your suggestions with no change, I have now installed Big Sur on an external SSD drive and booting time now reduced from almost 5 min. down to 37 seconds, I think it may be due to the fusion drive not having enough SSD space for Big Sur so it is split between SSD an Mechanical drive indicated by a quick first 1/3 of startup bar progress is quick and the balance of approximately 4 min for the remaining 2/3 including logon.

Regards

Michael

Boot Time very long since update to big sur