Comment by fidotron

> What percentile?

There's no argument that starts this way which doesn't end either with "support working offline", or defining when you consider that a user has stepped out of bounds with respect to acceptable parameters, which then raises the question what do you do in that event?

If all you're trying to do is say 75% of users have a good experience, and in your territory 75% means a 150ms and that's too long then the network cannot be in your critical path, and you have to deal with it. If you're on a low end phone any I/O at all is going to kill you, including loading too much code, and needs to be out of the way.

If you can tell the UX is going to be bad you will need to abort and tell them that, though they really will not like it, it's often better to prevent such users ever getting your app in the first place.

I come from mobile games, and supported titles with tens of millions of players around the world back in the early 4G era. All I can tell you is not once did mobile ping become a concern - in fact those networks are shockingly good compared to wifi.