"Inl_APVDiskStreamingUpdate" and "Inl_APVCellStreamingUpdate" cause poor Adaptive Probe Volume streaming performance at start when using a relatively large APV baking set, but improve after some time

Reproduction steps:
1. Open the attached project "ReproProj"
2. Open the “/Assets/Levels/worldBlockout_mk2/Scenes/persistent_scene.unity” Scene
3. Open the Profiler (Window > Analysis > Profiler)
4. Enter the Play Mode
5. Play for 5 - 10 minutes while observing the Profiler and FPS in the Stats tab

Expected result: FPS is always 37-45 and does not improve after a while
Actual result: After playing for some time, FPS improves, from 15 to 37-45, and fewer spikes become present in the Profiler

Reproducible with: 6000.0.54f1, 6000.1.14f1, 6000.2.0f1
Could not test with: 2022.3.62f1, 6000.3.0a4 (Assets\Systems\IntelSystem\SO\RumourNodeSO.cs(11,10): error CS0592: Attribute 'SerializeField' is not valid on this declaration type. It is only valid on 'field' declarations.)

Reproducible on:
Play Mode

Not reproducible on:
Windows Standalone Player

Testing environment: Windows 10 Enterprise 21H2
Not reproducible on: No other environment tested