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Extreme Slowness/Timeouts with Large Dataset (Chunked, Multi-Band Zarr Store)

performancePotential issues with Zarr performance (I/O, memory, etc.)Potential issues with Zarr performance (I/O, memory, etc.)

Status: Open.

#3085 In zarr-developers/zarr-python;

· mickyals opened on May 23, 2025

incremental writing to a sharded array slower than without sharding.

bugPotential issues with the zarr-python libraryPotential issues with the zarr-python library

performancePotential issues with Zarr performance (I/O, memory, etc.)Potential issues with Zarr performance (I/O, memory, etc.)

Status: Open.

#3014 In zarr-developers/zarr-python;

· iampritishpatil opened on Apr 24, 2025

Improve write performance of shards

needs release notesAutomatically applied to PRs which haven't added release notesAutomatically applied to PRs which haven't added release notes

performancePotential issues with Zarr performance (I/O, memory, etc.)Potential issues with Zarr performance (I/O, memory, etc.)

Status: Draft (not ready).

zarr-developers/zarr-pythonnumber 2977

#2977 In zarr-developers/zarr-python;

· balbasty opened on Apr 11, 2025

Codec pipeline memory usage

performancePotential issues with Zarr performance (I/O, memory, etc.)Potential issues with Zarr performance (I/O, memory, etc.)

Status: Open.

#2904 In zarr-developers/zarr-python;

· TomAugspurger opened on Mar 10, 2025

Performance regression in V3

bugPotential issues with the zarr-python libraryPotential issues with the zarr-python library

performancePotential issues with Zarr performance (I/O, memory, etc.)Potential issues with Zarr performance (I/O, memory, etc.)

Status: Open.

#2710 In zarr-developers/zarr-python;

· y4n9squared opened on Jan 14, 2025

Iteration over Zarr arrays is significantly slower in v3

performancePotential issues with Zarr performance (I/O, memory, etc.)Potential issues with Zarr performance (I/O, memory, etc.)

Status: Open.

#2529 In zarr-developers/zarr-python;

· tomwhite opened on Dec 3, 2024

Unnecessarily slow writes to uncompressed arrays

performancePotential issues with Zarr performance (I/O, memory, etc.)Potential issues with Zarr performance (I/O, memory, etc.)

V2Affects the v2 branchAffects the v2 branch

Status: Open.

#2518 In zarr-developers/zarr-python;

· jbuckman opened on Nov 26, 2024

[v3] benchmarks and performance tools

enhancementNew features or improvementsNew features or improvements

performancePotential issues with Zarr performance (I/O, memory, etc.)Potential issues with Zarr performance (I/O, memory, etc.)

Status: Open.

#2034 In zarr-developers/zarr-python;

· d-v-b opened on Jul 13, 2024

[v3] Performance test suite

performancePotential issues with Zarr performance (I/O, memory, etc.)Potential issues with Zarr performance (I/O, memory, etc.)

tests

Status: Open.

#1763 In zarr-developers/zarr-python;

· jhamman opened on Apr 5, 2024

In Memory performance compared to NumPy much slower

performancePotential issues with Zarr performance (I/O, memory, etc.)Potential issues with Zarr performance (I/O, memory, etc.)

Status: Open.

#1395 In zarr-developers/zarr-python;

· nuric opened on Apr 17, 2023

performance optimization in delitems

performancePotential issues with Zarr performance (I/O, memory, etc.)Potential issues with Zarr performance (I/O, memory, etc.)

Status: Open.

#1336 In zarr-developers/zarr-python;

· d-v-b opened on Jan 31, 2023

Zarr Array append method performance

performancePotential issues with Zarr performance (I/O, memory, etc.)Potential issues with Zarr performance (I/O, memory, etc.)

Status: Open.

#583 In zarr-developers/zarr-python;

· lucabergamini opened on Aug 11, 2020

Rechunking zarr file on S3 becomes very slow as number of initialized chunks increase

performancePotential issues with Zarr performance (I/O, memory, etc.)Potential issues with Zarr performance (I/O, memory, etc.)

Status: Open.

#559 In zarr-developers/zarr-python;

· mpu-creare opened on Apr 27, 2020

Zarr use case: problems in multi threaded access to in memory cache

performancePotential issues with Zarr performance (I/O, memory, etc.)Potential issues with Zarr performance (I/O, memory, etc.)

Status: Open.

#469 In zarr-developers/zarr-python;

· shikharsg opened on Aug 13, 2019

Storage to S3, LIST operations

performancePotential issues with Zarr performance (I/O, memory, etc.)Potential issues with Zarr performance (I/O, memory, etc.)

Status: Open.

#460 In zarr-developers/zarr-python;

· Cedric-LG opened on Jul 24, 2019

Potential synchronization optimization

performancePotential issues with Zarr performance (I/O, memory, etc.)Potential issues with Zarr performance (I/O, memory, etc.)

Status: Open.

#386 In zarr-developers/zarr-python;

· alimanfoo opened on Jan 9, 2019

Layered data caching

performancePotential issues with Zarr performance (I/O, memory, etc.)Potential issues with Zarr performance (I/O, memory, etc.)

Status: Open.

#382 In zarr-developers/zarr-python;

· jakirkham opened on Jan 4, 2019

Optimisation for the __contains__ method of storage.LRUStoreCache

performancePotential issues with Zarr performance (I/O, memory, etc.)Potential issues with Zarr performance (I/O, memory, etc.)

Status: Open.

#295 In zarr-developers/zarr-python;

· shikharsg opened on Aug 23, 2018