It is most likely that you are running into the max_keepalive limit.
José Valim

Thanks for the suggestion! It makes perfect sense. My main problem making this exercise was to make sure not to use any unfair advantage or specific configuration per language/framework to make sure they were as comparable as possible. Given all responses, requests and feedback I'm going to make this a series and will be sure to include this in the next one as well as open source the code.

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