Extremely poor performance using flex-direction in nested foldouts in ScrollView

Unity: UI Toolkit Framework

Fixed

6.0.X

6000.0.5f1

2023.3.X

Won't Fix

2023.2.X

2023.1.X

2022.3.X

2022.2.X

2021.3.X

Cancelling this 2023.2 tech release issue since the support for this release has come to end of life. Cancelling this 2023.2 port case does not affect any LTS or Unity 6 Beta/Preview that remain open.

The changes will not be brought to 2021.3 as the code is too different and would cause a high risk of regression

Reproduction steps:
1. Open the attached project “PerformanceIssue”
2. Open “Packages/CriticalForce.ObjectBuilderTool.Unity/Samples/Scenes/SampleScene” scene
3. Enter the Play mode

Expected result: The Editor enters the Play mode in a couple of seconds
Actual result: The Editor freezes for a minute or more before entering Play mode

Reproducible with: 2021.3.20f1, 2022.2.9f1, 2023.1.0b6, 2023.2.0a4
Couldn’t test with: 2020.3.45f1 - Errors in a custom package

Reproducible on: macOS 13.1 (Intel), Windows 10

Note: Removing flex-direction lines from .element-~~controls and .element~~-data in SampleStyle.uss removes the performance issues

Extremely poor performance using flex-direction in nested foldouts in ScrollView

Unity: UI Toolkit Framework

Fixed

Won't Fix

Prioritise and Follow this issue

Have a workaround or additional info about this issue?

Extremely poor performance using flex-direction in nested foldouts in ScrollView

Unity: UI Toolkit Framework

Statuses

Fixed

Won't Fix

Resolution Notes

2023.2.XWon't FixCancelling this 2023.2 tech release issue since the support for this release has come to end of life. Cancelling this 2023.2 port case does not affect any LTS or Unity 6 Beta/Preview that remain open.

2021.3.XWon't FixThe changes will not be brought to 2021.3 as the code is too different and would cause a high risk of regression

Description

Prioritise and Follow this issue

Have a workaround or additional info about this issue?