Unable to join or slow to join local multiplayer games

This report is for the released version 0.11.1 on iOS

When joining a local multiplayer game, the client can see the sky and other players but the map fails to appear or takes several minutes to appear. During this, the D-pad and buttons are disabled but you can usually look around by swiping the screen as normal. This means that the only means to exit is to kill the app. Often the other player's avatar seems to 'jitter' up and down.

This happens on iPhone 6, iPad AIR and iPad Mini 2 (often the iPads are more successful at connecting to each other than the iPhone - but still take a while)

All this on a network that has been in use extensively for the previous version

Note: When the attached screen shot was taken, I was actually seeing three images on screen, flickering very fast.