Site owner here! Even if it did take that long, browsers are clever enough not to wait until all the HTML is fetched as HTML can be processed in a streaming fashion. You can see here that stylesheets https://www.webpagetest.org/customWaterfall.php?test=240913_... are requested from the first bunch of HTML.

A second is little disappointing, but in fairness my lowly, single CPU, single core server with only 1 GB of RAM (a t2.micro server on AWS) was struggling a little with the load that Hacker News sent to it yesterday (16,000 page views in a day compared to about a third of that number for the whole month before that!). Plus the images on this page are a particularly big (because they are quite detailed so can't compress them more without losing that detail). So it was probably a bit slower than usual. At the minute everything is served from that one server (no CDN either at the mo - I really should stick it behind Cloudflare). It was a little play thing for me to test stuff out with, that became an occasional blog too on the side.