I'm guessing nobody tests for this, because everyone develops on fast, reliable internet connections and it's not super easy to simulate, although there are tools, dummynet probably being one of the oldest: https://gamedev.stackexchange.com/questions/61483/how-can-i-...

Chrome comes with a network throttle built-in.

Is it able to simulate spotty connections, where the connection keeps dropping in and out? Because I find that tends to be the thing that websites and applications most often don't factor for properly.

Cool, didn't know that. No excuses not to test properly then! :)