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Showing content from https://github.com/pandas-dev/pandas/issues/17410 below:

to_datime fastpath for %Y%m%d is slower · Issue #17410 · pandas-dev/pandas · GitHub

We have a check for whether format == '%Y%m%d', but this actually seems to be slower:

In [86]: s = pd.Series(['20120101']*1000000)

In [87]: %timeit pd.to_datetime(s)
229 ms ± 12.5 ms per loop (mean ± std. dev. of 7 runs, 1 loop each)

In [88]: %timeit pd.to_datetime(s, format='%Y%m%d')
749 ms ± 67.4 ms per loop (mean ± std. dev. of 7 runs, 1 loop each)

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