I have had upgraded 3 or 4 OS's since 2017 on my mac pro retina and loved each one of the upgrades. Now this BIG SUR is BIG disaster. Not only has my mac become non sense but even the whole UI and logic of work arounds and clicks to execute a process doesn't make sense. some of the Main issues : Boot up takes around 3- 4 mins compared to a min before, lets say on catalina or Mohave or previous versions the apps take forever to open , if they open , the icons just keep bouncing, dunno what that is now . Battery is draining like its no ones business , and weirdly enough , from 20% drops to 11 % then 1 % . amazing ! it took me around 3- 4 restarts and had to turnoff/on wifi several times to make it work, that is the new norm. the fan keeps coming on and the computer stalls randomly , i mean this is a disaster, are you watching this steve ??? This is just a brief summary of whats happening , the UX mess up is a whole different conversation. God Help #apple