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Asked: 2026-05-27T01:11:02+00:00

I’m working on chat application. The underlying server uses Node.js and the client/server communication

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I’m working on chat application. The underlying server uses Node.js and the client/server communication goes via WebSockets.

So the question is: how many simultaneous connections can such a server handle (without visible lags)? Of course approximately and assuming that the server is very powerful machine. I know this is not an easy question to answer but I just want ideas, some approximations… or at least upper and lower bounds. Of course I’m going to do some practical tests, but the theory may help me a bit.

Also I have another question related to the first one: is it possible to split Node.js applications into multiple machines? Keep in mind, that most of the data is held in machines memory rather then database.

Waiting for replies. 🙂

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  1. Editorial Team

    You’ll want to make sure you run node.js on top of epoll/kqueue and tune your OS for high TCP connection numbers.

    Here are a couple of measured numbers for a publish/subscribe system based on Autobahn WebSockets:

    • 180k concurrent, active WebSocket connections
    • 12k/s dispatched pubsub messages
    • 4k/s WebSocket opening handshakes
    • <8kB per WebSocket connection

    This is on a FreeBSD i386 virtual machine configured with 2 cores and 2GB RAM.

    Autobahn WebSockets is Python/Twisted based and runs on a kqueue reactor.

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