Editor lags when disabling or enabling Canvas with a lot of UI elements

How to reproduce:

1. Open the “UITest.zip“ project
2. Open the “SampleScene“
3. Enter Play Mode
4. Open ‘Window → Analysis → Profiler’
5. Press the “Toggle” button in the Game view to disable the “Canvas1” GameObject
6. Observe the Profiler
7. Press the “Toggle” button in the Game view to enable the “Canvas1” GameObject
8. Observe the Profiler

Actual result: ~10000ms spike when enabling the GameObject and ~5000ms when disabling
Expected result: <100ms spike when enabling/disabling the GameObject

Reproducible in: 6000.0.65f1, 6000.3.3f1, 6000.4.0a3, 6000.4.0b3, 6000.5.0a4
Not reproducible in: 6000.4.0a2 (79bd4f638ac0)

Reproduced on: Windows 11 Pro (25H2)
Not reproduced on: No other environment tested

Note: Only reproducible in the Editor