I was the person who emailed him about it earlier.

2024-09-05, me:

On another topic, I just noticed that the 700+ comments on https://news.ycombinator.com/item?id=41445413 all render on a single page. Hurray! Is the pagination approach obsolete now? I know that you've commented several times about wanting to optimize the code so pagination wasn't necessary. I don't know if that's finished or if pagination will have to go on the next time there's a big breaking story.

Dan G:

Yes: the performance improvements I've been working on for years finally got deployed, so pagination is turned off for now.

(In case you're curious, the change is that Arc now runs over SBCL instead of Racket.)

...

Btw you're the only person I know of who's noticed this and pointed it out so far!

I have very mixed feelings about how much I know about this site.