Serhiy Storchaka added the comment:
For the worst case the drawback is significant:
$ ./python -m perf timeit -s "s = set('a%s' % i for i in range(100))" --
"s.add('test'); s.discard('test')"
Unpatched: Median +- std dev: 861 ns +- 82 ns
Patched: Median +- std dev: 2.81 us +- 0.18 us
How large the benefit in the best case? I can't get any significant difference.
$ ./python -m perf timeit -s "a = ['a%s' % i for i in range(1000)]" -- "set(a)"
Unpatched: Median +- std dev: 130 us +- 6 us
Patched: Median +- std dev: 127 us +- 8 us
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<http://bugs.python.org/issue29476>
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