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⚡️ Speed up function std by 13% #284

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⚡️ Speed up function std by 13% #284

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5 changes: 5 additions & 0 deletions pandas/core/array_algos/masked_reductions.py
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Original file line number Diff line number Diff line change
Expand Up @@ -194,6 +194,11 @@ def std(
if not values.size or mask.all():
return libmissing.NA

# Avoid runtime warning context overhead when not necessary for performance
mask_any = mask.any() if mask.size else False
if not mask_any:
# Fast path: no missing, call directly
return np.std(values, axis=axis, ddof=ddof)
with warnings.catch_warnings():
warnings.simplefilter("ignore", RuntimeWarning)
return _reductions(
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