Bet it's static or server-side rendered, and not running much JS in either case. Every time I've been surprised at the speed of a site in the last few years it's been static or some old-school server-side stuff—even PHP. All our "modern" web stacks are embarrassingly bloated and require heroic effort to be as fast as "bad" old tech.

It is static rendered HTML. But https://perldoc.pl is dynamically rendered (it is a Mojolicious app) and the difference is not noticeable to me except on huge pages. perldoc.perl.org before the refresh was already static HTML but very slow. I think there is a lot more to it than deployment strategy.

I noticed snappiness on perldoc.pl as well. Fantastic!

Bet you're right.

The great majority of the site's content is pulled from POD docs that come with the Perl distro. No reason to convert that at every request. I wouldn't be surprised if most of the tooling to make Perldoc is on CPAN already.

Dude, it is fast! wuh?