Editor performance drops significantly when dragging the Timeline playhead over a specific clip with the Inspector open

How to reproduce:

1. Open the attached project “IN-152135”
2. In the Project window, open the “Assets/Scenes/AnimatedProperty/SampleScene_AnimatedProperty” scene
3. Ensure that the Inspector, Timeline and Profiler windows are visible on screen
4. In the Hierarchy, select the “SuperDirector” GameObject
5. In the Timeline window, select the last “Setting” clip
6. Ensure that the target mode in the Profiler window is set to Edit Mode
7. Drag the playhead over the “Setting” clip and observe the Profiler

Actual result: Editor performance slows down when dragging the playhead over the clip
Expected result: Editor performance does not change when dragging the playhead over the clip

Reproducible with: 1.8.1 (6000.3.23f1), 1.8.13 (6000.3.23f1), 6000.6.0b10, 6000.7.0a5
Not reproducible with: 1.8.0 (6000.3.23f1)

Reproducible on: macOS 26.5.2 (M4 Max)
Not reproducible on: No other environments tested