Having a lot of slowdown and graphical issues after updating to Big Sur 11.0.1 on my Macbook Pro 13 (intel i5 2017).
Mainly occurs when I go fullscreen and scroll down a page. It will stutter heavily or when I go back to a tab after not using it for a minute or so, it will be a blank page. Refreshing it is the only way for the site to appear.
I can provide the GPU error report from Opera://GPU if an Opera team member is interested.
Updated Opera today to 72.0.3815.378, which didn't help. Tried Opera Beta and still have the same issue.