Or, it's just busy :) I think the software in general have problems with long/deeply nested comment chains so maybe having a few of those being popular is enough to bring things to a halt.
By the way, you can usually work around performance issues on HN by either logging out (removing cookies if it doesn't load) or using incognito mode/private window (being logged out) as then the software can just serve cache views instead of having to fetch data on each navigation.
Edit: from the almighty dang:
> I've moved that one off the front page, partly because these are more or less the same story, but mostly because the traffic on this is boiling our poor server and I need to resort to tricks. Sorry all!
From "Twitter Suspends PG's Account" - https://news.ycombinator.com/item?id=34044525
Seems Elon Musk/Twitter is the one to blame for HN being slow right now.
nah, look at twitter for example! i don't think that's the reason of HN being slow/not responding..
It's great for what it is but pg's application design philosophy seems to have stopped at "macros go brrrr" so it has definite limits as well.
PG created this community, and elon musk is in charge of the other one. Who isn't coming to hacker news to see the comments?
Let the fun begin.
"[...] but mostly because the traffic on this is boiling our poor server and I need to resort to tricks. Sorry all!"
The server IIRC does a decent amount of work per page determining your user-id and various behaviors of the text. But if you're a default, anonymous, "private" browser, the webpage is always more responsive.
Not necessarily "as responsive as it should be" mind you, but it does seem to help.