Marco Paolini <markopaol...@gmail.com> added the comment:

also worth noting escape sequences for non-ascii characters are slower, even 
when encoded length is the same.

python -m pyperf timeit -s 'import json;' -s  'c = "€"; s = json.dumps(c * 
(2**10 // len(json.dumps(c)) - 2))' 'json.loads(s)' -o nonascii2k.json

python -m pyperf timeit -s 'import json;' -s  'c = "a"; s = json.dumps(c * 
(2**10 // len(json.dumps(c)) - 2))' 'json.loads(s)' -o ascii2k.json

Mean +- std dev: [ascii2k] 2.59 us +- 0.04 us -> [nonascii2k] 9.98 us +- 0.12 
us: 3.86x slower (+286%)

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<https://bugs.python.org/issue37587>
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