Author Topic: Big Sur latest update  (Read 591 times)

Big Sur latest update
« on: 03 October, 2021, 01:16:07 pm »
This morning I updated Big Sur on my 2020 MacBookAir.
It took ages to complete, probably over an hour.

Just now I updated Big Sur on my 2015 iMac.
It did it in about 30 seconds.

Why so the difference?

Jaded

  • The Codfather
  • Formerly known as Jaded
Re: Big Sur latest update
« Reply #1 on: 03 October, 2021, 01:33:30 pm »
Is it possible that the first one downloaded the update file and the second one used that file, rather than download it? I cant remember if OSx does that automatically, but it can do.
If you don't like your democracy, vote against it.

CommuteTooFar

  • Inadequate Randonneur
Re: Big Sur latest update
« Reply #2 on: 03 October, 2021, 02:04:02 pm »
It's a long time ago but I used to find that downloading from the main apple server could be very slow when a new updated arrived. A little while after it would be ok.  I also found that if an update was slow give up on the graphical interface and get the update with the command line tool which used a different server.

Re: Big Sur latest update
« Reply #3 on: 03 October, 2021, 04:30:24 pm »
Would it be that the MacBook used wifi whereas the iMac was attached by a piece of string?

Re: Big Sur latest update
« Reply #4 on: 03 October, 2021, 05:37:17 pm »
I'd also considered whether that might be the case.

TimC

  • Old blerk sometimes onabike.
Re: Big Sur latest update
« Reply #5 on: 04 October, 2021, 12:33:54 am »
The update on my 2015 MBP was about 4.5Gb. It didn't take long - maybe 25 minutes.

Re: Big Sur latest update
« Reply #6 on: 04 October, 2021, 08:01:53 am »
The OS on Big Sur is read-only and cryptographically signed. When you do an update it has to download and replace the whole thing. There are no “updates”.

However due to the magic of snapshots on APFS, it can do this on a separate copy and do an instant switcheroo when it’s finished.

So your first computer had to do the work while you waited. Your second computer had already done all the work and just needed to switch the OS volume for the new one.