STINNER Victor <vstin...@python.org> added the comment:
Ooooh, I see. I didn't measure the performance of the right header. I re-run a
benchmark using the HTTP header (repeat=15):
header = 'Basic ' + ', ' * 15 + 'A'
Now I see a major performance difference. Comparison between master ("ref") and
PR 18284 ("fix"):
Mean +- std dev: [ref] 88.9 ms +- 2.4 ms -> [fix] 17.5 us +- 0.7 us: 5083.23x
faster (-100%)
So the worst case is now way faster: more than 5000x faster!
It's even possible to go up to repeat=10**6 characters, it still takes less
than 1 seconds: 412 ms +- 19 ms.
On the master branch, repeat=20 already takes around 3 seconds... The slowdown
is exponential with repeat increase.
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<https://bugs.python.org/issue39503>
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