Re:Nice idea, but... (Score 1)

Any change outside that scene branch (i.e., window movement) never affect the client process.

Ah right. So basically the lower overhead comes from a lower granularity of server upcalls... I guess that is a logical way of doing it. Anyway I'm sure you have thought through this quite a lot. I think Berlin is looking really good now. I always thought that using CORBA would be possible and efficient in a modern windowing system so I'm really hoping for this to be the Next Big Thing. Keep it up!