I absolutely agree with OP. I find it annoying that things load like that - even on a gigabit line with a beefy modern CPU. The solution is not to slow everything down to wait for the last thing to be loaded.

That UI/UX is getting slower as everything is getting faster is a sad reality of the times. But I guess that's the price of faster iterations, easier developer flows and a building on top of the lates greatest framework.