Funnily enough the biggest offender of Cumulative Layout Shift (CLS) metric in my daily life is google search with its "people also search for" feature that causes me to constantly misclick.
Yeah I looked at the code once and I believe it was recursively collapsing every single comment under when you clicked collapse, and also storing the state of each in localstorage I think. It didn't quite make sense. I think it has been fixed though it's much faster now.
Also not sure when we're finally get non-paginated page loads.