# New deploy of PerfCompare (Dec 4th, 2025)

**URL:** <https://discourse.mozilla.org/t/new-deploy-of-perfcompare-dec-4th-2025/146636>\
**Category:** Firefox Tooling Announcements\
**Tags:** perfcompare\
**Created:** [December 4, 2025, 9:56pm UTC](https://discourse.mozilla.org/t/new-deploy-of-perfcompare-dec-4th-2025/146636 "2025-12-04T21:56:06Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![csevere](https://sea1.discourse-cdn.com/flex001/user_avatar/discourse.mozilla.org/csevere/32/50457_2.png) [@csevere](https://discourse.mozilla.org/u/csevere)\
**Post date:** [December 4, 2025, 9:56pm UTC](https://discourse.mozilla.org/t/new-deploy-of-perfcompare-dec-4th-2025/146636/1 "2025-12-04T21:56:06Z")

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The latest version of[PerfCompare](https://perf.compare) is now live! This release includes the first part of the **PerfCompare Statistics Project** which aims to improve the accuracy and interoperability of data analysis.

Check out the change-log below to see the updates:

**Highlights:**

[misspran]

- Pcf 661 subtests render (#962)

- Update types, add testCompareMannWhitneyData to fixtures, and test to revision row (#950)

- PCF 651 mode analysis (#951)

- CombinedResultsItemType (#967)

- Update types for useTableFilters and useTableSort with CombineResultsItemType (#968)

- remove cliffs delta percentage logic (#970)

- Add getColumnsConfiguration and render in ResultsTable (#969)

- mann-whitney subtests headers (#971)

[beatrice-acasandrei]

- Add a warning banner under or above the results/subtests table view when MWU stats are used (#976)

[kala-moz]

- Extract PValCliffs into separate comp and update dark mode styles (#959)

- switched positions of mode and stats warnings (#977)

- updated positions and styles (#978)

- fix for test version edit bug (#979)

**Other minor fixes:**

[misspran]

- fix refetch testVersion (#960)

- add fix to dark mode bug (#972)

[kala-moz]

- persist the testVersion selection in url (#958)

Thank you for the contributions!

Bugs or feature request can be[filed on Bugzilla](https://bugzilla.mozilla.org/enter_bug.cgi?product=Testing&component=PerfCompare&status_whiteboard=%5Bpcf%5D). The team can also be found on[the #perfcompare channel on Element](https://matrix.to/#/#perfcompare:mozilla.org). Come and chat!