Not VM related, but for anyone interested in general networking, here is the impact of a 200mbps Powerline run on an FTTC connection:
Powerline is connected between the Openreach modem and an RT-N56U, generally gets around ~60mbits peak on the ring I'm running it on. It seems to add around ~3ms latency, a small amount of jitter (over Ethernet there is no yellow unless I'm downloading), and noticeable intermittent packet loss.
Dirty power indeed!