I'm not disagreeing that python is slow, but why would you choose to do either in a shell script?

    $ time cat<<EOL
    {"name": "JP", "object": {"fruit": "Orange", "point": {"x": 10, "y": 20}, "number": 17}, 
    "sunday": false}  
    EOL
    {"name": "JP", "object": {"fruit": "Orange", "point": {"x": 10, "y": 20}, "number": 17}, 
    "sunday": false}

    real 0m0.002s
    user 0m0.000s
    sys  0m0.002s