I'm not sure the "landing page" optimisation is all that relevant to HN. However: Aside from the threads issue everyone else has mentioned, I've noticed that a

I'm not sure the "landing page" optimisation is all that relevant to HN. However: Aside from the threads issue everyone else has mentioned, I've noticed that apart from the main HTML, the co2stats tracker is the only part of the site that doesn't have proper cache-control headers and thus incurs a query every time (resulting in a 200 OK, not a 304 Not Modified, say); worse, the javascript portion can also take a while to load (up to 2 seconds), even though the returned content never actually seems to change. The co2stats image also never is cached. You should probably prod them to fix that (they're YC funded, right?).