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138 Open 2,127 Closed
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Issues list

BUG: Slower DataFrame.plot with DatetimeIndex Datetime Datetime data dtype Performance Memory or execution speed performance Visualization plotting
#61398 opened May 6, 2025 by Abdelgha-4
3 tasks done
@thehalvo
2
BUG: Performance issue with fillna() after merging DataFrames Missing-data np.nan, pd.NaT, pd.NA, dropna, isnull, interpolate Needs Info Clarification about behavior needed to assess issue Performance Memory or execution speed performance
#61180 opened Mar 26, 2025 by sjfakharian
2 of 3 tasks
2
PERF: why nlargest is so slower? Needs Info Clarification about behavior needed to assess issue Performance Memory or execution speed performance
#61076 opened Mar 7, 2025 by ZGarry
3 tasks done
5
BUG: Memory leak when creating a df inside a loop Bug Closing Candidate May be closeable, needs more eyeballs Constructors Series/DataFrame/Index/pd.array Constructors Performance Memory or execution speed performance Windows Windows OS
#60897 opened Feb 9, 2025 by Chuck321123
3 tasks done
17
BUG: memory leak when slice series var assigning to itself Bug Copy / view semantics Performance Memory or execution speed performance
#60640 opened Jan 2, 2025 by hefvcjm
2 of 3 tasks
4
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
2
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
2
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
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
BUG: Pandas Discrepancies in Handling Non-English Data During Memory Optimization Bug Copy / view semantics Performance Memory or execution speed performance
#58233 opened Apr 12, 2024 by smbslt3
3 tasks done
1
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
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
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
ProTip! What’s not been updated in a month: updated:<2025-04-10.