I've Imac 21.5 2018 I have a really big problem with BigSur. Opening time come to 3-4min (before 15-20sec) I'm waiting to import images to Illustrator and waiting for saving the document up to 10min sometimes. Some of the design tasks inside the design software have always lag and problems, I don't get the results. Closing the computer is also really slow. After opening the computer, I'm waiting 10-12 min to capable to open any of the software. Trying to solve this issue: I reset my mac 2-3 times and set up everything again.. And I didn't get any results..

I have Imac 32gb ram 1 tb ssd 4gb vram etc. It was really powerful. I did lots of design works and filming etc, in 2 years. 2 weeks before I upload Big Sur and I format it today. but it was also painfully caused by the disc system is a chance to another one and sierra cannot format that format. And I forced to recover too big sur again.. I hope they will fix fast..