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From their readme-

"The test was only set to reach up to 100 concurrent connections (each sending 1000 messages per second) - Total of 100K messages per second."

So they had only 100 concurrent connections.

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Number of connections, message size, and frequency of messages sent are three main parameters to measure performance, and for some frameworks like Engine.IO, number of connections seems to have the biggest impact on performance (https://medium.com/node-js-javascript/b63bfca0539). It would be good to see the benchmarks with much higher number of connections, as non-blocking IO is usually why people choose Node.js platform.

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