Comment by branko_d

> Networks are fast.

Well, it depends on what you mean by “fast”: bandwidth or latency? While the bandwidth has improved enormously over the years, latency… not so much. And it never will due to the simple fact that the speed of light is limited.

Most of the slowness seems to come about by treating latency as something that doesn’t matter (because the testing is done on a local, low-latency network) or will improve radically over time because bandwidth did (which it will not).

Unfortunately, React wants to be both a rendering library and also manage state by tying it to the component lifetime, which encourages cascaded fetching - exactly the kind of workload that is sensitive to latency.