"IOGrid is an IO game engine/framework built using SocketCluster and Phaser. It lets you build multi-player games like Agar.io and Slither.io and also multi-player simulations/experiments for research purposes. It is designed to scale across multiple processes to make use of all CPU cores on a machine.
The game world is divided into cells which will be distributed across available SC worker processes. Basic initial tests indicate that this engine can scale linearly across available CPU cores - I've found that doubling the number of worker processes allowed the engine to handle approximately double the number of bots whilst maintaining the average CPU usage per worker process at 50%."