Little's law is an astounding equation that's dead simple, yet it can bring an amazing insight into what your distributed system is capable of.

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More resources:

* Little's law: https://en.wikipedia.org/wiki/Little%27s_law

* John Little: https://en.wikipedia.org/wiki/John_Little_(academic)

* Node.js and CPU intensive requests: https://stackoverflow.com/questions/3491811/node-js-and-cpu-intensive-requests

* My talk where I mention Little's law (from 23:03: https://www.youtube.com/watch?v=5TJiTSWktLU&t=23m03s)