[issue1675951] [gzip] Performance for small reads and fix seek problem

[Florian Festi]

Florian Festi <florianfesti at users.sourceforge.net> added the comment:

Attached result of a run with stdlib gzip module only. Results indicate that performance still is as bad as on Python 2. The Python 3 gzip module also still makes use of tell() ans seek(). So both argument for including this patch are still valid.

Porting the patch will include some real work to get the bytes vs string split right.

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Added file: http://bugs.python.org/file18917/result-py3.txt

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