>I'm not convinced the web pages were really _that_ slow to start with, so it feels like an unnecessary project (well, excepting the fact that web-page bloat has massively increased as people use more and more javascript libraries &c.).

Right. It's super easy to make lightning fast web pages. In fact, that's the default state of a static HTML page. It actually takes a lot _more_ work to make pages slow by adding tons of javascript, dependencies, server-side applications, etc.

From the article linked elsewhere in this thread: >The 90th percentile weight for the canonical version is 5,229kb. [...] The 90th percentile request count for the canonical version is 647

There's the problem. Over 5 megabytes and 647 requests for one article? 5MB is equivalent to about 20 full-length novels or 1,000 pages of text. And 647 requests?! That must be one extremely comprehensive article, right? No, it's 1 request for a brief article and 646 unnecessary requests wasting bandwidth to load unnecessary stuff. Then people wonder why it's slow. But someone put in a lot of work to fluff that page up to be that huge and slow and use that many requests.