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Probably service workers. If the site has a service worker the traditional cache-busting hard refresh is just a normal refresh.

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That’s an interesting theory. I checked though and didn’t find service workers on this page [1] so it could just be something with the server itself. I caught another slower load just now and server timing showed a long wait for the first byte.

[1]: https://devdocs.io/dom/serviceworkercontainer/getregistratio... "navigator.serviceWorkers.getRegistrations()"

TTFB includes DNS lookup, server generation of the page, and actual sending of the data. I'd guess it's one of the first two at fault.

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