The article is a comprehensive breakdown of how to use service workers with HTML content to reduce network payloads (47.6% reduction cited) and decrease first content paint times (52.3% reduction cited). Beyond just the 'why' of service workers it shows how to actually set them up for your site, the implications for dynamic and static sites, and includes a rich set of additional resources to dig deeper.

Found via tweet from @slightlylate, "Pretty sure I've pointed this out before, but the architecture that @philwalton outlines in this post is the platonic ideal for nearly every content site in 2020. If your tools don't support getting to this architecture, get new tools"