I have problem with this presentation - it doesn't seem to contain too many details. What mobile, what browsers, what 3g networks, etc. Sure, there are issues

I have problem with this presentation - it doesn't seem to contain too many details. What mobile, what browsers, what 3g networks, etc. Sure, there are issues - Safari (I think) used to crash when you opened inspector on a page with ws. Some (meteor.com) just ignore all those issues by disabling native ws altogether. Performance of polling SockJS transports is enough for them now, so why bother? If you find a real problem with SockJS in the wild - please do let us know!