Not mine, because I mostly write internal tools. But other have. warp, the Haskell web server has really good performance. Most of it is thanks to the excellent runtime of Haskell. I once sae a blog post where they wrote a simple webserver for static files and the performance was comparable to nginx
According to field reports by my fellow colleagues, every naive network-bound implementation does 8-9K RPS, which is good enough 9 times of 10.
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