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Issues list

PERF: regression on mean(axis=1) compared to old pandas version Copy / view semantics Performance Memory or execution speed performance
#60469 opened Dec 2, 2024 by Remy-ooo
2 of 3 tasks
7
BUG: why arrow no affect in Intel chips？ Arrow pyarrow functionality Needs Info Clarification about behavior needed to assess issue Performance Memory or execution speed performance
#60466 opened Dec 2, 2024 by wonb168
3 tasks done
1
PERF: index.unique much slower than get_level_values.drop_duplicates Algos Non-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diff Closing Candidate May be closeable, needs more eyeballs Performance Memory or execution speed performance
#60213 opened Nov 6, 2024 by jacek-pliszka
2 of 3 tasks
1
PERF: dropna with SparseArray experiments a much worse time complexity Groupby Performance Memory or execution speed performance Sparse Sparse Data Type
#60179 opened Nov 4, 2024 by mflova
3 tasks done
2
PERF: Slowdowns with .isin() on columns typed as np.uint64 isin isin method Performance Memory or execution speed performance
#60098 opened Oct 24, 2024 by adrian17
2 of 3 tasks
PERF: DataFrame fragmentation when calling DataFrame.assign() with large kwargs Needs Discussion Requires discussion from core team before further action Performance Memory or execution speed performance
#60075 opened Oct 20, 2024 by y-koj
2 of 3 tasks
5
PERF: Extreme regression in 2.2 when aggregating a DataFrame with .attrs data Closing Candidate May be closeable, needs more eyeballs Groupby metadata _metadata, .attrs Performance Memory or execution speed performance
#60070 opened Oct 18, 2024 by buhrmann
2 of 3 tasks
4
QST: Consistently apply Welford Method and Kahan Summation in roll_xxx functions API Design Needs Discussion Requires discussion from core team before further action Performance Memory or execution speed performance Reduction Operations sum, mean, min, max, etc.
#59715 opened Sep 5, 2024 by kaixiongg
2 tasks done
7
PERF: Difference in using zipped pickle files IO Pickle read_pickle, to_pickle Performance Memory or execution speed performance
#59279 opened Jul 19, 2024 by buhtz
2 of 3 tasks
4
BUG: CoW does not seem to work on an index with duplicated labels Closing Candidate May be closeable, needs more eyeballs Copy / view semantics Performance Memory or execution speed performance
#59272 opened Jul 18, 2024 by arnaudlegout
2 of 3 tasks
@sgysherry
10
Potential performance regression with "CLN: enforce deprecation of frequencies deprecated for offsets" Performance Memory or execution speed performance Regression Functionality that used to work in a prior pandas version
#58962 opened Jun 8, 2024 by DeaMariaLeon
PERF: future_stack=True with non-MulitIndex columns Performance Memory or execution speed performance Reshaping Concat, Merge/Join, Stack/Unstack, Explode Stale
#58817 opened May 24, 2024 by rhshadrach • Draft
4 of 5 tasks
3.0
1
4
PERF: df.unstack() is 500 times slower since pandas>=2.1 Performance Memory or execution speed performance Reshaping Concat, Merge/Join, Stack/Unstack, Explode
#58391 opened Apr 23, 2024 by sbonz
2 of 3 tasks
1
@rhshadrach
10
Potential regression induced by commit 9cd5e55 Performance Memory or execution speed performance Regression Functionality that used to work in a prior pandas version
#58287 opened Apr 17, 2024 by rhshadrach
88 tasks
2.3
4
Potential regression induced by commit 924f246 Output-Formatting __repr__ of pandas objects, to_string Performance Memory or execution speed performance Regression Functionality that used to work in a prior pandas version
#58285 opened Apr 17, 2024 by rhshadrach
3 tasks
3.0
4
Potential regression induced by "Refactored pandas_timedelta_to_timedeltastruct" Needs Triage Issue that has not been reviewed by a pandas team member Performance Memory or execution speed performance Regression Functionality that used to work in a prior pandas version
#57951 opened Mar 21, 2024 by DeaMariaLeon 3.0
6
Potential regression induced by "Cython guard against [c|m|re]alloc failures" Closing Candidate May be closeable, needs more eyeballs Performance Memory or execution speed performance
#57950 opened Mar 21, 2024 by DeaMariaLeon
5
PERF: improve StringArray.isna Performance Memory or execution speed performance Stale Strings String extension data type and string data
#57733 opened Mar 5, 2024 by jorisvandenbossche Loading…
5 tasks
9
Potential regression induced by PR #56921 Performance Memory or execution speed performance Regression Functionality that used to work in a prior pandas version Warnings Warnings that appear or should be added to pandas
#57641 opened Feb 27, 2024 by DeaMariaLeon 3.0
@rhshadrach
2
Potential regression induced by PR #57302 Performance Memory or execution speed performance Regression Functionality that used to work in a prior pandas version Reshaping Concat, Merge/Join, Stack/Unstack, Explode
#57620 opened Feb 25, 2024 by rhshadrach 3.0
@rhshadrach
PERF: groupby.first and groupby.last fallback to apply for EAs ExtensionArray Extending pandas with custom dtypes or arrays. Groupby Performance Memory or execution speed performance Reduction Operations sum, mean, min, max, etc.
#57591 opened Feb 23, 2024 by rhshadrach
3
PERF: Improve merge performance Performance Memory or execution speed performance Reshaping Concat, Merge/Join, Stack/Unstack, Explode Stale
#57559 opened Feb 21, 2024 by phofl Loading…
5 tasks
12
Potential perf regressions introduced by Copy-on-Write Copy / view semantics Performance Memory or execution speed performance Regression Functionality that used to work in a prior pandas version
#57431 opened Feb 15, 2024 by rhshadrach
22 of 50 tasks
9
Potential regression induced by PR #56037 Non-Nano datetime64/timedelta64 with non-nanosecond resolution Performance Memory or execution speed performance Regression Functionality that used to work in a prior pandas version
#57366 opened Feb 11, 2024 by rhshadrach 2.3
4
PERF: pd.BooleanDtype in row operations is still very slow NA - MaskedArrays Related to pd.NA and nullable extension arrays Needs Info Clarification about behavior needed to assess issue Performance Memory or execution speed performance Reduction Operations sum, mean, min, max, etc.
#56903 opened Jan 16, 2024 by Alexia-I
2 of 3 tasks
10
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