ID 361900 - Lag and instability when preview rendering with "use multiple threads" enabled

Problem summary
Lag and instability when preview rendering with "use multiple threads" enabled. This issue seems to correlate with specific hardware configurations. In extreme cases, this may cause a crash.

Customer reported version
modo.12.1v1

Customer reported platform
windows10

Steps to reproduce
1) Open Modo.
2) Open the attached scene and link the provided VDB file if prompted.
3) Open the preview renderer and begin rendering.
4) Try to operate the interface while rendering.
Result: selecting items, switching tabs, etc can be laggy or cause the UI to freeze.

Workaround
Disable "use multiple threads" in the preview render settings.

Reproduced by support
This bug has been reproduced in:
12.1v1 - Windows 10
12.0v1 - Windows 10
11.2v3 - Windows 10
11.2v1 - Windows 10

Unable to reproduce bug in:
12.1v1 - OSX 10.13.5
11.1v1 - Windows 10, OSX 10.13.5
11.0v3 - Windows 10, OSX 10.13.5
10.2v4 - Windows 10, OSX 10.13.5

Earliest version tested
11.1v1 - Windows 10, OSX 10.13.5 - This issue no longer appears in this version and has regressed

Expected behaviour
The UI should not become laggy/freeze when rendering via the preview renderer.

Actual behaviour
The UI can become laggy on some devices when rendering via the preview renderer.