alt Hacker NewsI get what you're trying to say, but aren't you blowing it a little out of proportion? At my job we have an SPA that loads a dashboard with 20+ widgets, all doing their own requests, transferring 2+ MB (compressed) of JS. It loads in two seconds, with all caches disabled. And I mean full load, not "ready for interaction". It runs on Vue 3.
I agree that the web could be lighter, but "finding one that will do a first load under 10s is close to impossible" sounds like exaggeration - it might not be due to the framework or lack thereof.
Btw, the webapp I'm describing is NOT built by the best of the best.
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I know I'm weird because I grew up in the 90s, but 2 MB of JS to show a dashboard with widgets still doesn't quite compute in my brain.
Transfer's only part of the story (and 2MB is a ton on anything but a great connection)—the rest is memory use, which will tend to be some multiple of the transfer size, plus whatever your code initializes, and processor cycles.
Now test it again on a 5 year old mobile device on a 3g connection with some packet loss, not in the sterile environment that is your office with a last-gen i7 processor.