Node.js Socket.IO Server ↔ Official JavaScript Client: Is Concurrent-Load Latency a Transport or Adapter Decision?
A Socket.IO 4.x server on Node.js, paired with the official JavaScript client, must be sized for a workload where latency is expected to surface only when concurrent connections and emits ramp up. The open decision is where such latency would belong: the Engine.IO polling-to-WebSocket upgrade path, the single process's event loop, or the multi-node adapter l