My iMac is utterly unusabled since the Big Sur updated. It can't handle simple daily tasks like coding and emails without grinding to halt, and takes about 10 minutes to reboot after it crashes. Great work Apple this is the worst update in history, you have surpassed Microsoft finally at something. I especially love the fact you've brought back that old feature favourite 'the spinny wheel of death'!! I'm equally impressed by the general OS responsiveness that puts catatonic mummified pharoe's to shame.