http://stackoverflow.com/a/13241506/445073

import simplejson as json
import msgpack
import timeit

def test_json():
    with open('test.json') as fh:
        json.load(fh)

def test_msgpack():
    with open('test.msgpack') as fh:
        msgpack.load(fh)

if __name__ == "__main__":
    for test in ('json', 'msgpack'):
        print test,
        print timeit.timeit(
            '__main__.test_{0}()'.format(test),
            setup='import __main__',
            number=10000
        )