investigating #448 we are seeing continuous 100% CPU (caused by one thread per one core) if we run --validator --chain dev --key Alice, even without any other nodes connected. We are not seeing this, if the node is not the proposer. However if we link up the proposing node with another node, we are also seeing a continuous 100% CPU usage of two threads on that second node. This suggests we are looping without necessity in the importing thread.