Realtime game server for 2d game

Can ICP be used to host a game server for a WebGL based Unity game. Not turn based. Two or more clients send and receive updates of game state from a server. Or is there a 2 second delay no matter what. So far the guide below is the best I can find.

https://medium.com/dfinity/how-i-built-a-multiplayer-reversi-game-on-the-internet-computer-f67d2fed0fc3