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(fix): handle internal type promotion and <code>na</code>s for extension arrays properly

AutomationGithub bots, testing workflows, release automationGithub bots, testing workflows, release automation

CIContinuous Integration toolsContinuous Integration tools

dependenciesPull requests that update a dependency filePull requests that update a dependency file

io

topic-arraysrelated to flexible array supportrelated to flexible array support

topic-backends

topic-CF conventions

topic-cftime

topic-dask

topic-DataTreeRelated to the implementation of a DataTree classRelated to the implementation of a DataTree class

topic-documentation

topic-groupby

topic-html-repr

topic-hypothesisStrategies or tests using the hypothesis libraryStrategies or tests using the hypothesis library

topic-indexing

topic-NamedArrayLightweight version of VariableLightweight version of Variable

topic-performance

topic-plotting

topic-rolling

topic-testing

Status: Draft (not ready).

pydata/xarraynumber 10423

#10423 In pydata/xarray;

· ilan-gold opened on Jun 16, 2025

Fancy isel on LazilyIndexedArray allocates memory of about the size of backing dataset

topic-indexing

topic-performance

Status: Open.

#10311 In pydata/xarray;

· jder opened on May 12, 2025

First invocation of <code>open_dataset</code> takes 3 seconds due to backend entrypoint discovery being slow

bug

topic-backends

topic-performance

Status: Open.

#10178 In pydata/xarray;

· rabernat opened on Mar 26, 2025

reindex is very slow with small chunksizes

bug

topic-lazy array

topic-performance

Status: Open.

#10054 In pydata/xarray;

· Illviljan opened on Feb 16, 2025

High unmanaged memory using kwargs in apply_ufunc with Dask

bug

topic-dask

topic-performance

Status: Open.

#9981 In pydata/xarray;

· abiasiol opened on Jan 23, 2025

Enable zero-copy <code>to_dataframe</code>

enhancement

topic-pandas-like

topic-performance

Status: Open.

#9792 In pydata/xarray;

· rabernat opened on Nov 17, 2024

perf improvement for interp: set <code>assume_sorted</code> automatically

topic-interpolation

topic-performance

Status: Open.

#9758 In pydata/xarray;

· dcherian opened on Nov 9, 2024

Slow open_datatree for zarr stores with many coordinate variables

io

topic-backends

topic-DataTreeRelated to the implementation of a DataTree classRelated to the implementation of a DataTree class

topic-performance

topic-zarrRelated to zarr storage libraryRelated to zarr storage library

Status: Open.

#9640 In pydata/xarray;

· TomNicholas opened on Oct 17, 2024

Performance of deep DataTrees

contrib-help-wanted

topic-DataTreeRelated to the implementation of a DataTree classRelated to the implementation of a DataTree class

topic-internals

topic-performance

Status: Open.

#9511 In pydata/xarray;

· TomNicholas opened on Sep 17, 2024

Parallelize map_over_subtree

topic-dask

topic-DataTreeRelated to the implementation of a DataTree classRelated to the implementation of a DataTree class

topic-performance

Status: Open.

#9502 In pydata/xarray;

· eni-awowale opened on Sep 16, 2024

<code>DataTree.to_zarr()</code> is very slow writing to high latency store

topic-backends

topic-DataTreeRelated to the implementation of a DataTree classRelated to the implementation of a DataTree class

topic-performance

topic-zarrRelated to zarr storage libraryRelated to zarr storage library

Status: Open.

#9455 In pydata/xarray;

· slevang opened on Sep 8, 2024

Groupby-map is slow with out of order indices

topic-dask

topic-groupby

topic-performance

Status: Open.

#9220 In pydata/xarray;

· mrocklin opened on Jul 9, 2024