2.3.7 Scalability & Performance

. Horizontal Scaling

• Run multiple Socket.io instances behind a load balancer; use a Redis adapter (socket.io-redis) to synchronize state and events.

• This ensures that messages or signals from one instance are seen by clients connected to any other instance.

2. Sharding / Namespaces

• Large-scale apps might separate concerns (e.g., /chat, /trading) into Socket.io namespaces to reduce overhead and simplify event management.

3. Network Optimizations

• For voice/video, ensure TURN servers are geographically distributed.

• Use WebRTC data channels for ephemeral data exchange if it proves more efficient than Socket.io for certain features.