json vs. simplejson

[Thomas Heller]

Diez B. Roggisch schrieb:
> Thomas Heller wrote:
> 
>> Python 2.6 contains the json module, which I thought was the renamed (and
>> improved?) simplejson module that also works on older Python versions.
>> 
>> However, it seems the json is a lot slower than simplejson.
>> This little test, run on Python 2.6.2 and WinXP shows a dramatic
>> difference:
>> 
>>   C:\>py26 -m timeit -s "from json import dumps, loads"
>>   "loads(dumps(range(32)))" 1000 loops, best of 3: 618 usec per loop
>> 
>>   C:\>py26 -m timeit -s "from simplejson import dumps, loads"
>>   "loads(dumps(range(32)))" 10000 loops, best of 3: 31 usec per loop
>> 
>> Does anyone have an explanation for that?
> 
> Dunno about json, but simplejson comes with an (optional) C-based
> speedup-module.
> 
> Maybe this isn't part of the standard distribution? 


json has it's own _json speedup module.  And funny, on Linux, json
WITH _json is still somewhat slower (~10%) than simplejson WITHOUT
the _speedups module.

Thomas