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PERF: Shallow copy Series in timeseries plotting #62886

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Merged
merged 2 commits into from
Oct 28, 2025
+2 −2
Merged

PERF: Shallow copy Series in timeseries plotting #62886

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108e7b3
Use shallow copies in pandas/plotting
mroeschke Oct 26, 2025
46790dd
Merge remote-tracking branch 'upstream/main' into perf/plot/copy
mroeschke Oct 27, 2025
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4 changes: 2 additions & 2 deletions pandas/plotting/_matplotlib/timeseries.py
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Original file line number Diff line number Diff line change
Expand Up @@ -75,7 +75,7 @@ def maybe_resample(series: Series, ax: Axes, kwargs: dict[str, Any]):

if ax_freq is not None and freq != ax_freq:
if is_superperiod(freq, ax_freq): # upsample input
series = series.copy()
series = series.copy(deep=False)
# error: "Index" has no attribute "asfreq"
series.index = series.index.asfreq( # type: ignore[attr-defined]
ax_freq, how="s"
Expand Down Expand Up @@ -142,7 +142,7 @@ def _replot_ax(ax: Axes, freq: BaseOffset):
labels = []
if data is not None:
for series, plotf, kwds in data:
series = series.copy()
series = series.copy(deep=False)
idx = series.index.asfreq(freq, how="S")
series.index = idx
# TODO #54485
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