Testing out my LAN performance when on wifi, I was only getting 4.5 - 8 Mbps. It's certainly a crowded field. Must take extra time for those radio packets to elbow through the neighborhood scrum. Today my powerline ethernet adapters arrived (D-Link 307AV, £50 for a pair). Does it work? Oh yes: 78 Mbps, even though one is plugged into a shared power strip (suboptimal) instead of a wall socket. Take that, wifi.