hash-function-benchmark
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C++ 11 uses MurmerHash3
C++ 11 uses MurmerHash3 surprised you are seeing a big difference in performance.
https://github.com/gcc-mirror/gcc/blob/master/libstdc++-v3/libsupc++/hash_bytes.cc
https://stackoverflow.com/questions/19411742/what-is-the-default-hash-function-used-in-c-stdunordered-map