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Pull requests: pandas-dev/pandas
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PERF: cythonizing _concat_date_cols; conversion to float without exceptions in _does_string_look_like_datetime Datetime Datetime data dtype Missing-data np.nan, pd.NaT, pd.NA, dropna, isnull, interpolate Performance Memory or execution speed performance
ENH: RangeIndex redux Enhancement Indexing Related to indexing on series/frames, not to indexes themselves Performance Memory or execution speed performance
Add chunksize param to read_json when lines=True IO JSON read_json, to_json, json_normalize Performance Memory or execution speed performance
PERF: Implement groupby idxmax/idxmin in Cython Groupby Performance Memory or execution speed performance Reduction Operations sum, mean, min, max, etc.
ENH: add arrow engine to read_csv Enhancement IO CSV read_csv, to_csv Performance Memory or execution speed performance Stale
#31817 by lithomas1 was closed Dec 8, 2020 Loading…
4 of 5 tasks
PERF: block-wise arithmetic for frame-with-frame Internals Related to non-user accessible pandas implementation Performance Memory or execution speed performance
PERF: Parse certain dates in Cython instead of falling back to dateutil.parse Datetime Datetime data dtype Performance Memory or execution speed performance
[READY] perf improvements for strftime Datetime Datetime data dtype Performance Memory or execution speed performance Stale
#51298 by smarie was closed Oct 5, 2025 Loading…
5 tasks done
BUG/PERF: Sort mixed-int in Py3, fix Index.difference Compat pandas objects compatability with Numpy or Python functions Dtype Conversions Unexpected or buggy dtype conversions Indexing Related to indexing on series/frames, not to indexes themselves Performance Memory or execution speed performance
API: add DatetimeBlockTZ #8260 Internals Related to non-user accessible pandas implementation Performance Memory or execution speed performance Timezones Timezone data dtype
ENH/PERF: enable column-wise reductions for EA-backed columns ExtensionArray Extending pandas with custom dtypes or arrays. Numeric Operations Arithmetic, Comparison, and Logical operations Performance Memory or execution speed performance Stale
#32867 by jorisvandenbossche was closed Jun 16, 2021 Loading…
ENH: dataframe memory usage Output-Formatting __repr__ of pandas objects, to_string Performance Memory or execution speed performance
PERF/BUG: use masked algo in groupby cummin and cummax Groupby NA - MaskedArrays Related to pd.NA and nullable extension arrays Performance Memory or execution speed performance
Cythonized GroupBy Fill Groupby Missing-data np.nan, pd.NaT, pd.NA, dropna, isnull, interpolate Performance Memory or execution speed performance
PERF: Use a C Union in maybe_convert_numeric Mothballed Temporarily-closed PR the author plans to return to Performance Memory or execution speed performance
#51029 by lithomas1 was closed Aug 11, 2023 Loading…
5 tasks
fix series.isin slow issue with Dtype IntegerArray ExtensionArray Extending pandas with custom dtypes or arrays. Indexing Related to indexing on series/frames, not to indexes themselves Performance Memory or execution speed performance
Add nrows to read json. IO JSON read_json, to_json, json_normalize Performance Memory or execution speed performance
PERF: CategoricalIndex.get_loc should avoid expensive cast of .codes to int64 Categorical Categorical Data Type Performance Memory or execution speed performance
#21699 by topper-123 was closed Oct 19, 2018 Loading…
2 of 4 tasks
REGR: be able to read Stata files without reading them fully into memory IO Stata read_stata, to_stata Performance Memory or execution speed performance Stale
PERF: Slow performance of to_dict (#46470) IO Data IO issues that don't fit into a more specific label Performance Memory or execution speed performance Stale
used regular expression in Datetime data dtype Performance Memory or execution speed performance
format_is_iso() Datetime Introduction of RangeIndex API Design Indexing Related to indexing on series/frames, not to indexes themselves Performance Memory or execution speed performance
#9977 by ARF1 was closed Dec 30, 2015 Loading…
15 of 25 tasks
ENH: Only apply first group once in fast GroupBy.apply Groupby Performance Memory or execution speed performance
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