I updated Premier Pro from 2019 to 2020 at the same time with Catalina Update last year. than I couldn't edit anything in Premier Pro 2020. Video continued buffering and audio was noisy. When I used 2019 ver. again, it was possible to edit it. But it was slower and harder than before the Catalina update. I updated to 2021 version this time. There is also the same problem. audio was noisy and video was repeated like a network failure.
I really want to fix this problem. It's almost been 2 years.
Even though I'm a paid member, I haven't even tried the new version yet.
here is my spec
iMac 5K 27", 2019
3.7GHz 6core intel core i5
Radeon Pro 580X 8GB
Should I low level format the iMac and re-install iOS?