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Pull requests: pandas-dev/pandas
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Performance improvements for nunique method. Missing-data np.nan, pd.NaT, pd.NA, dropna, isnull, interpolate Performance Memory or execution speed performance Reshaping Concat, Merge/Join, Stack/Unstack, Explode
PERF: nunique perf improved by using len(unique) rather than value_counts Performance Memory or execution speed performance
PERF: performance improvements in multi-key groupby Groupby Performance Memory or execution speed performance
BUG: Fix not to reindex on non-Categorical groups (GH9049) Numeric Operations Arithmetic, Comparison, and Logical operations Performance Memory or execution speed performance
PERF: Cython optimizations for period module, round one Performance Memory or execution speed performance Period Period data type
PERF: performance improvement in MultiIndex.sortlevel MultiIndex Performance Memory or execution speed performance
PERF: improves performance and memory usage of DataFrame.duplicated Performance Memory or execution speed performance
PERF: improve perf of writing csv's with datetimes IO CSV read_csv, to_csv Performance Memory or execution speed performance
RangeIndex as default index API Design Indexing Related to indexing on series/frames, not to indexes themselves Performance Memory or execution speed performance
#9999 by ARF1 was closed May 2, 2015 Loading… updated May 2, 2015
BUG: declare and use self.unique_check API Design Performance Memory or execution speed performance
#9526 by toobaz was closed May 9, 2015 Loading… updated May 9, 2015
PERF: astype(str) on object dtypes GH8732 Performance Memory or execution speed performance Strings String extension data type and string data
#8971 by vikram was closed May 9, 2015 Loading… updated May 14, 2015
ENH: Series.resample performance with datetime64[ns] #7754 Datetime Datetime data dtype Performance Memory or execution speed performance
PERF: write basic datetimes faster IO CSV read_csv, to_csv Output-Formatting __repr__ of pandas objects, to_string Performance Memory or execution speed performance
PERF: increase performance of str_split when returning a frame Performance Memory or execution speed performance Strings String extension data type and string data
ENH: Enable ExcelWriter to construct in-memory sheets Bug IO Excel read_excel, to_excel Performance Memory or execution speed performance
PERF: parse and timedelta ops improvements, #6755 Performance Memory or execution speed performance Timedelta Timedelta data type
PERF: improved performance of multiindex slicing MultiIndex Performance Memory or execution speed performance
Improve categorical concat speed by ~20x Categorical Categorical Data Type Enhancement Performance Memory or execution speed performance
BUG: Repeated time-series plot causes memory leak Performance Memory or execution speed performance Visualization plotting
PERF: BlockPlacement.copy() speed-up Performance Memory or execution speed performance
#10073 by ARF1 was closed Aug 5, 2015 Loading… updated Aug 5, 2015
PERF: add initial asv config and vbench->asv conversion script Performance Memory or execution speed performance
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