REGR: Performance regression on RollingGroupby · Issue #38038 · pandas-dev/pandas (original) (raw)

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@cpmbailey

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@cpmbailey

pd.DataFrame({'a': np.random.randn(10000000), 'b': 1}).groupby('b').rolling(3).mean() is approximately 10x slower between 1.0.5 and 1.1.x

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