<img src='http://files.facepunch.com/garry/2015/January/03/2015-01-03_14-43-31.png'> It's obviously hard to get any solid work done during the holidays, but a few of us have still been cranking it as best we can.
My plan right now is to make more stats and insight available over time (like bandwidth usage).. but for now this simple fps counter is incredibly useful.
Performance is 'ok' right now. What you'll find is that after loading a save your server's framerate will drop to about 10fps until it's finished working out all the building's stability details. After that it should run ok for a few days until it needs a wipe. I'm making a lot of progress on making wipes be required a lot less frequently.