Reproduction steps:
1. Open the attached “Repro“ project
2. Open the “/Assets/Scenes/SampleScene.unity“ Scene
3. Select the “Animation Timeline” GameObject in the Hierarchy
4. Observe Editor behaviour
Expected result: “Animation Timeline” gets selected instantly
Actual result: Editor freezes for a second or two
Reproducible with: 2021.3.34f1, 2022.3.17f1, 2023.2.4f1, 2023.3.0b1
Not reproducible with:
Reproducible on: M1 MacOS 14.1
Not reproducible on: No other environment tested
Note: Selecting the GameObject also allocates a few hundred MB of memory