[Sended it already as bug report ingame]
We're experience huge connection issues with our map.
We figured out, that when our steel-ingot factory is powered it crashes the connections. Other players connected can't do anything.
If we power down the steel ingot factory, then it works fine (well not fine, still with a delay, but the delay getting bigger and bigger as the map grows).
Again if we connect power to it: Dead. We can walk and stuff, but we can't use anything.
Here is an image of it:
(6/12 are working, the other ones got no coal - so they don't build anything)