Thanks, it does indeed bottleneck my upload, when there are no horde surges the server goes along happy at around 40 to 70KB/s upload once the panic or hordes spawn then it spikes up to 115KB/s and it even tried to go as far as 200KB/s but that must have been a fart because I can't reach such a upload speed.
The slight upgrade could help, but if that wants to spike to 200KB/s It maybe cause lag as well, so for 8 players smooth gameplay you would need nearly 2mbps upload speed? xd
Also tried to disable server voice chat in an attempt to lessen the lag a bit, but it does not seem to help very much.