Hitching when there's a hidden raster layer in the document

Having an raster in the scene, even a hidden one results in huge performance drop.

### performance w/ raster present but not visible (intermittent hitching)
https://github.com/user-attachments/assets/b8e787fa-616a-4acd-b87c-60294d743d26

Start by reproducing the intermittent hitching described in the issue with a raster layer present but hidden, using the attached performance video as the reference. Profile the document while toggling or retaining the hidden raster layer, then verify that hidden raster content no longer causes the reported performance drop.

索引モデルが issue の本文から書いたものです。