The same problem wit my iMac 27 2017
After the update to Big Sur my Mac isSo much slower, it is lagging
iMac (Retina 5K, 27-inch, 2017)
Processor 3,4 GHz Quad-Core Intel Core i5
memory 20 GB 2400 MHz DDR4
Graphics Radeon Pro 570 4 GB
AdamPL
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