Node.js web frameworks are slow

I’ve tried run this tests on Windows with node 4.4.4, express 4.14 and I can say that the difference between raw node and express framework is 0.7 ms on my machine.
Clean node 3.3ms, Express 4.0ms
I use Apache AB for benchmark. 50000 requests. Councurency level 8, max time 30 sec.
ab.exe -c 8 -t 30 -k [http://sitename:port]

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