FPS when adding instanced static meshes in a random order is significantly lower than adding them in order by X,Y,Z location

Adding instanced static meshes in a random order by location gives 25% of normal frame rate, compared to adding them in order by X,Y,Z location.

1. Download Sample: [Link Removed]
2. Play in Editor: Standalone Mode
3. Show FPS and Observe frame rate is very slow
4. End Play
5. In the "ism_spawner blueprint," reverse branch output in order to "build in order by X,Y,Z"
6. Play in Editor Standalone Mode
7. Show FPS and Observe:
   RESULT: frame rate is approx 2-3 times faster
   EXPECTED: frame rate to be approximately the same regardless of how static meshes are spawned into level