ID 376685 - Dense scene freezes UI when a fusion item is present, even if that fusion item contains no meshes

Problem summary
Dense scene freezes UI when a fusion item is present, even if that fusion item contains no meshes.

Customer reported version
modo.12.2v1

Customer reported platform
n_a_mac

Steps to reproduce
1) Open Modo.
2) Open attached scene.
3) Press shift + a to center the scene.
4) Pan/Rotate/Zoom around the mesh item, while continually moving the mouse cursor over top of the mesh.
Result: Modo will occasionally freeze temporarily when the mouse cursor passes over the mesh.

Workaround
Either hide/disable any fusion items, or convert the dense mesh to a static mesh.
Note: Hiding the fusion item only works in version 12.0v1 and above. In prior versions, it must be deleted or the mesh converted to a static mesh.

Reproduced by support
This bug has been reproduced in:
12.2v1 - Windows 10, OSX 10.13.5
12.1v2 - Windows 10
12.0v1 - Windows 10
11.2v3 - Windows 10
11.2v1 - Windows 10
11.1v1 - Windows 10
11.0v3 - Windows 10
10.2v4 - Windows 10, OSX 10.13.5

Earliest version tested
10.2v4 - Windows 10, OSX 10.13.5 - This issue appears to be in all versions of the product

Expected behaviour
UI should not freeze when mousing over a dense mesh with a fusion item in the scene.

Actual behaviour
The UI freezes temporarily when mousing over a dense mesh if a fusion item is in the scene.