cpython_json_cjson_pickle

cpython_json_cjson_pickle.py

import time
import cPickle as pickle
import json
import cjson
import ujson

d = {
    'foo': 'bar',
    'food': 'barf',
    'good': 'bars',
    'dood': 'wheres your car?',
    'wheres your car': 'dude?',
}

print 'Starting json...'
start = time.time()
for i in xrange(1000000):
    json.dumps(d)
print 'done:', time.time() - start

print 'Starting cjson...'
start = time.time()
for i in xrange(1000000):
    cjson.encode(d)
print 'done:', time.time() - start

print 'Starting ujson...'
start = time.time()
for i in xrange(1000000):
    ujson.encode(d)
print 'done:', time.time() - start

print 'Starting pickle...'
start = time.time()
for i in xrange(1000000):
    pickle.dumps(d)
print 'done:', time.time() - start


# cpython 2.7
#Starting json...
#done: 17.138479948
Starting cjson...
#done: 4.70037078857
#Starting ujson...
#done: 1.57113099098
#Starting pickle...
#done: 13.5882430077
#
# cpython 2.6.6
#Starting json...
#done: 24.083124876
#Starting cjson...
#done: 2.36736512184
#Starting pickle...
#done: 7.88932514191

Your results are not really reliable, see https://gist.github.com/3134391.