Even just a year or two ago its web interface was way snappier. Now an issue with a non-trivial number of comments, or a PR with a diff of even just a few hundred or thousand lines of changes causes my browser to lock up.

But even clicking around tabs and whatnot is noticeably slower. It used to be incredibly snappy.

Which website lets you load PRs with 1000 lines and it’s fast? Honest question, it’s not gitlab.

It's ~80 KiB. Do you think 80 KiB should be slow?

GH just a few days ago told me that it couldn't fetch the files changed because there were too many files changed. There were 4.

You didn’t answer the question

I’ve really enjoyed Gitea wherever I’ve used it.

My company’s self hosted gitlab achieves this all the time.