Performance#
This library is written in Cython for a better performance than a pure-Python implementation could give you.
Decoder Performance#
The library has about the same speed as the shipped json module for pure JSON data.
Version: Python 3.9.1+ (default, Feb 5 2021, 13:46:56)
CPU: AMD Ryzen 7 2700 @ 3.7GHz
pyjson5.decode(): 2.08 s ± 7.49 ms per loop (lower is better)json.loads(): 2.71 s ± 12.1 ms per loopThe decoder works correcty:
json.loads(content) == pyjson5.loads(content)
Encoder Performance#
The encoder generates pure JSON data if there are no infinite or NaN values in the input, which are invalid in JSON.
The serialized data is XML-safe, i.e. there are no cheverons <>, ampersands &, apostrophes ' or control characters in the output.
The output is always ASCII regardless if you call pyjson5.encode() or pyjson5.encode_bytes().
Python 3.9.1+ (default, Feb 5 2021, 13:46:56)
CPU: AMD Ryzen 7 2700 @ 3.7GHz
pyjson5.encode(): 1.37 s ± 19.2 per loop (lower is better)json.dumps(): 3.66 s ± 72.6 ms per loopjson.dumps()+xml.sax.saxutils.escape(): 4.01 s ± 21.3 ms per loopThe encoder works correcty:
obj == json.loads(pyjson5.encode(obj))
Benchmark#
Using Ultrajson’s benchmark you can tell for which kind of data PyJSON5 is fast, and for which data it is slow in comparison (higher is better):
json |
pyjson5 |
ujson |
orjson |
|
|---|---|---|---|---|
Array with 256 doubles |
||||
encode |
6,425 |
81,202 |
28,966 |
83,836 |
decode |
16,759 |
34,801 |
34,794 |
80,655 |
Array with 256 strings |
||||
encode |
36,969 |
73,165 |
35,574 |
113,082 |
decode |
42,730 |
38,542 |
38,386 |
60,732 |
Array with 256 UTF-8 strings |
||||
encode |
3,458 |
3,134 |
4,024 |
31,677 |
decode |
2,428 |
2,498 |
2,491 |
1,750 |
Array with 256 True values |
||||
encode |
130,441 |
282,703 |
131,279 |
423,371 |
decode |
220,657 |
262,690 |
264,485 |
262,283 |
Array with 256 dict{string, int} pairs |
||||
encode |
11,621 |
10,014 |
18,148 |
73,905 |
decode |
17,802 |
19,406 |
19,391 |
23,478 |
Dict with 256 arrays with 256 dict{string, int} pairs |
||||
encode |
40 |
38 |
68 |
213 |
decode |
43 |
49 |
48 |
51 |
Medium complex object |
||||
encode |
8,704 |
11,922 |
15,319 |
49,677 |
decode |
12,567 |
14,042 |
13,985 |
19,481 |
Complex object |
||||
encode |
672 |
909 |
731 |
|
decode |
462 |
700 |
700 |