Reproduction steps:
1. Open the attached project "NavMeshSlow"
2. Enter Play mode
3. Select "ChunkBuilder" in the Hierarchy
4. Click "Build NavMesh" in the Inspector
Expected result: The sphere keeps moving
Actual result: The Editor freezes for 1-2 seconds, the sphere isn't moving at that time
Reproducible with: 2021.3.22f1, 2022.2.12f1, 2023.1.0b9, 2023.2.0a9
Could not test with: 2020.3.46f1 (Script compilation errors)
Reproducible on: macOS 13.2.1 (Intel), Windows 10 (user's)