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Matteo Collina says that the node fetch under the hood is the fetch from the undici node client [0]; and that also, because it needs to generate WHATWG web streams, it is inherently slower than the alternative — undici request [1].

[0] - https://www.youtube.com/watch?v=cIyiDDts0lo

[1] - https://blog.platformatic.dev/http-fundamentals-understandin...

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If anyone is curious how they are measuring these are the benchmarks: https://github.com/nodejs/undici/blob/main/benchmarks/benchm...

I did some testing on an M3 Max Macbook Pro a couple of weeks ago. I compared the local server benchmark they have against a benchmark over the network. Undici appeared to perform best for local purposes, but Axios had better performance over the network.

I am not sure why that was exactly, but I have been using Undici with great success for the last year and a half regardless. It is certainly production ready, but often requires some thought about your use case if you're trying to squeeze out every drop of performance, as is usual.

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