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Re:iMac slows down after Big Sur upgrade by manicdee on Saturday November 28, 2020 @02:10AM (#25235912)
Welcome to Spotlight reindexing everything immediately after new OS upgrade.

Wait a day then come back if the pain persists.

Re:iMac slows down after Big Sur upgrade by kalnins on Saturday November 28, 2020 @01:21AM (#25235706)
Probably the iMac is throttling due to battery getting old.
Re:iMac slows down after Big Sur upgrade by ch_123 on Saturday November 28, 2020 @06:45AM (#25237019)
The iMac is a desktop