Because I have not yet profiled Rainbows for this use case. I advised Eric to add support, but not yet (for more than a year I think: - /) I managed to look into it.
Thin is a fairly light server, there is probably less overhead. It could also be more common things, like how you compiled the http parser, for example.
Without additional information about the platform, builds, and actual performance, it's hard to say more. Perhaps I may repeat myself, I would expect.
Another thing worth mentioning is that my asynchronous hackers are not intended for / speed / before concurrency. Many speed-oriented tests are not suitable.
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