This happens to my group of friends. However only when a third player downloads the map. It starts off at the maximum download speed of 2mbps but rapidly degrades to 10kbps. The hosts upload speed is not being maxed out. The download speed immediately increases when the second player disconnects ...

Ok, I read on the wiki ithat clients still communicate VIA p2p when using the server, I miss understood. Regardless that does not explain why when a third player on the same LAN as player 2 tries to download the map, it is several times slower until the other player on the LAN disconnects.

Edit ...

My friends and I are running into an issue when a third player joins and downloads the map

Player 1 our host is running a dedicated server he connects to it directly from his LAN

Player 2 me connects to his server over the WAN with a ping of 40ms

Player 3 is on the same LAN as me

When its just ...