8000 REGR: Performance regression on RollingGroupby · Issue #38038 · pandas-dev/pandas · GitHub
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REGR: Performance regression on RollingGroupby #38038
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REGR: Performance regression on RollingGroupby#38038
#38057
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PerformanceMemory or execution speed performanceRegressionFunctionality that used to work in a prior pandas versionWindowrolling, ewma, expanding
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1.1.5
@cpmbailey

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@cpmbailey
cpmbailey
opened on Nov 24, 2020

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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