https://www.avorion.net/forum/index.php/topic,5964.0.html
https://www.avorion.net/forum/index.php/topic,6061.0.html
I wiped our world, and started the server with 0.29.5, verified there was no transfer using nload and during login the outgoing bandwidth shot to 10 mb/s and stayed at 700-900 kBit/s. Something is streaming continuously from the server. I was not moving, and it was a fresh world.
I will keep the ProsperCraft server down until this is fixed, I can't justify that much bandwidth used per player when I have a lot of players on.