If they are using socket API for UDP, performance is not critical for them. Otherwise porting UDP servers to DPDK/netmap is not rocket science and gets you like an order of magnitude better performance.
A shooter running at 30Hz (high side for free developer sponsored servers) with even 100 players is only going to be processing at most 10-15K packets per second, and that’s assuming 5 packets per tick per player. Server update rates are usually lower than the internal physics and game logic tick rate as well, so it’s doubtful to even be that high.
These aren’t stats of the gameplay servers, these are the backend servers that handle matchmaking, player stats, inventories and progression.
These aren’t stats of the gameplay servers, these are the backend servers that handle matchmaking, player stats, inventories and progression.