Godot version

4.0.alpha.custom_build.97c0dd74d

System information

Linux 5.18.14-arch1-1

Issue description

When working with voxel_tools, I noticed very high idle CPU usage whenever a VoxelInstancer, or any child of a VoxelInstancer, is selected in the editor: Zylann/godot_voxel#422

It turns out that the 3D viewport recomputes the AABB of every selected node and all their children every frame. voxel_tools uses StaticBody instances in the instancer, so this means it is recomputing 1000s of AABBs every frame, even if the camera is not moving. It might be that voxel_tools could work around this, but it seems like a lot of work to update AABBs that aren't changing.

profile.txt

appears to be the offending section.

Steps to reproduce

1. Create a StaticBody
2. Add 1000s of CollisionShape children
3. Select the StaticBody in the editor
4. Note that CPU climbs
5. Select a single one of the CollisionShape children
6. Note that CPU drop

Minimal reproduction project

example.zip