[issue35195] Pandas read_csv() is 3.5X Slower on Python 3.7.1 vs Python 3.6.7 & 3.5.2 On Windows 10

[Dragoljub]

Dragoljub <dragoljub at gmail.com> added the comment:

After some more digging it appears that we see the 3.5x slowdown manifest in Python 3.7.0a4 and is not present in Python 3.7.0a3.

One guess is that 

https://docs.python.org/3.7/whatsnew/changelog.html#python-3-7-0-alpha-4

bpo-29240: Add a new UTF-8 mode: implementation of the PEP 540

may contribute to this slowdown on windows. Is there a way to ensure we disable any native to UTF conversion that may be happening in Python 3.7.a4?

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