High Population Experimental Servers 120 Cap?

Heyo,

I have a server (au) hosted on my box, each day it exceeds 100 players. Once it hits 120 though it starts to show signs of lag. Is there a maxx population the new Rust can handle or is it potentially a networking issue. My server box can handle a lot more that 120 players.

Also it's not DDoS, I've been DDoS'd many times and the server definitely isn't getting DDoS'd.

Cheers