So there has been an on going thread about powerline adapters, well the OP finally got some - and I was curious about speed he is seeing, etc. So told him would post up links to some tools.
This lead me to compiling the latest version of iperf3 I could find for windows Since I couldn't find one. So figured post it up if anyone is interested.
Got the source from here https://github.com/esnet/iperf
Found a blog post how to compile on windows here http://www.embedded