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I am building a file synchronization program (not unlike Dropbox) using node.js on both ends. I need to have potentially thousands of clients requesting data at the same time. Here is my current system: Server pushes notifications to client over a websocket (file has been updated) Client queues downloads and makes an HTTP request when idle I will be serving data in compressed chunks of, say, 50 MB each, so the HTTP request overhead (headers) is negligible. If I were to use websockets for requests and push notifications, would there be: Noticeable overall speed improvements? (reduced latency, authentication, etc.) Additional overhead on the server to keep connections open? Issues with pushing binary data? I think I need to have notifications sent over a dedicated websocket because I don't want them to be queued on the server while a download is taking place (lots of overhead). Note: These websockets will be open long-term, as long as the client's system is on. EDIT: I will be using the websockets on a different http server on different ports in order to move them to different CPU cores. I could potentially have thousands (if not hundreds of thousands) of concurrent websockets open...

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