Weird page content visualization ?
Whenever I open the browser or open a new page on some site the content on those pages takes it's time to redistribute itself across the screen from left to right or right to left. It's sort of like a clipping. Why is that ? It's not like that on other browsers, Chrome included. It's a very ugly thing to see.
Very large gray rectangles?
I cant guess what you mean. ;)
Which site and Vivaldi and Windows is this?
@Gwen-Dragon No figures or anything. It's just content re-positioning itself not fast enough not to be noticeable like its in other browsers.