Same here Macbook pro retina 13 inch late 2015 Very big difference on performance. Boot time at about 1 minute and slow response on opening apps. Is this Apple's marketing strategy for us to buy new one?

Same here. MacOS seems very laggy now. Windows on bootcamp is way faster on boot than Apple's macOS itself. I regret I upgrade, no easy way to downgrade. I hope Apple will release an update/fix for this.

Big sur is a wrong name. Bug Sur is the best fit. #BUGSUR Let's make this a trend so apple notice this and provide a fix.

Good job apple for slowing down old macs. New sales coming in.