Slightly offtopic, but I wonder how much overhead in those benchmarks comes from calling native code from .NET runtime? An interesting data point could be benchmarking equivalent implementation in C or C++, avoiding the overhead of native-managed transition.
In my experience, interfacing native code via C++/CLI has negligible overhead, unless arguments are big and complex data types, which have to be converted to .NET types.
Otherwise, unsafe regions have practically zero overhead, and they are close enough to the metal.
