I understand the reasoning behind this benchmark, but the Python results aren't super relevant because the library is written in C.
What is interesting is the Dart/Go comparison. Dart's VM still doesn't have a lot of the optimizations that will ultimately be in there and it's keeping pace pretty well with Go's much more mature compiler (which are based on the Plan 9 compilers).
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I understand the reasoning behind this benchmark, but the Python results aren't super relevant because the library is written in C.
What is interesting is the Dart/Go comparison. Dart's VM still doesn't have a lot of the optimizations that will ultimately be in there and it's keeping pace pretty well with Go's much more mature compiler (which are based on the Plan 9 compilers).
I think you havd it backwards. The Go compiler has few optimizations, while the V8 project is much more mature.
The PyPy JSON parser is pure python and gets sped up by the JIT.