[issue9410] Add Unladden Swallow's optimizations to Python 3's pickle.

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

I'm working on #3873 to add a read buffer (fixed size, 4096 bytes) to the unpickler. It's 6 to 8 times faster with the read buffer: but this patch is mainly to avoid the overhead introduced by the new I/O library (in Python2, unpickler was faster because it doesn't need to call Python functions to read some bytes). Is this feature included in this big patch?

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