Hey everyone. I recently rented a dedicated server and managed to recruit at least 20 players in my country to play together. Before officially opening the server, I spent a lot of time testing mods and stability, and everything worked fine — at least when there were fewer than 10 people online. I even tried killing over a thousand zombies in a short time with other players, and the server had no problems at all.
But tonight, when I tried to open the server to players, it ran smoothly with 1 to 13 players online. However, once the number hit 14, the server became extremely laggy, with severe desync issues—driving vehicles and using items was nearly impossible. Player ping and server performance all looked normal.
I’ve tried many things to troubleshoot, like: I made sure the game is on an SSD, ports 16261 and 16262 are open (but players can't connect via port 16262, so I’m not sure about that), allocated 24GB of RAM, set vehicle speed limit to 45, ensured all players are active within a single town/area, and checked bandwidth, packet loss, ping, RAM and CPU usage—everything seems normal… So what’s the problem? Is it the mods? Or did I set the zombie count too high?
If anyone knows, please tell me. Thanks for reading all this.