> You need to be able to reliably hide ~100-200ms of latency for any number of reasons. If you're talking about something that runs over wifi you're fighting against the laws of physics and no back-end infrastructure is going to save you.

There's margin no? I mean, right now I get 3ms ping to Google from my wired computer, and 10~15ms from my phone on wifi. Wifi doesn't add that much.

And I'm in a large European city, not in Silicon Valley.