GitHub code review is nigh unusable

I'm trying to view comments that I just submitted on a GitHub pull request's "Files changed" tab and GitHub is now telling me:

Only the first 40 comments are currently being shown. To see more, switch back to the classic page.

But if I go back to the classic page, I instead see this warning:

Some comments aren't visible on the classic Files Changed page. Switch to the new experience.

There is simply no way to see my comments alongside the code that they are referring to.

Then of course the whole GitHub web experience is a laggy disaster now as well (as is frequently mentioned in discussions on here).