Earlier quoted context omitted.
When the user triggers a change of the underlying data, I do a roundtrip to the server and re-render the current page. I keep the time needed to do so under a second. My users regularely express how WOWed they are by the snappyness of my sites. I guess what other sites save on re-rendering html, they lose multiple times on bloated code.
That literally means that you aren't doing SPAs. If you aren't doing SPA then yes using React or Vue is rather a waste. However the majority of sites these days use some form of SPAs. Also under a second is a very low bar to strive to. a fast round trip to the server is 100ms. A reasonable one is somewhere around 300ms. Displaying effects to changes is often under a millisecond in SPAs and is basically impossible to…
Do you have a reference for that claim? I very much doubt you are correct, but I'd be interested in seeing some stats either way, if they exist.