[issue34128] Release GIL periodically in _pickle module

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

The demo script shows around 8% slowdown to me for

    data = list(map(float, range(N)))

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34128>
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