ID 458563 - Extreme sheen values exponentially increase render times

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Problem summary
Extreme sheen values exponentially increase render times. This is with the default renderer and the principled material.

Steps to reproduce
1) Open Modo.
2) Select File > Open from the menu bar and open the provided scene.
3) Press "F9" to begin the render.
Result: The render will take much longer than expected given the simplicity of the scene file.

Expected behaviour
Render times should not increase to this extent.

Actual behaviour
Render times increase more than expected.

Workaround
Unknown. 

Reproduced by support
This bug has been reproduced in:
14.1v3 - Windows 10
14.0v2 - Windows 10
13.0v1 - Windows 10
12.1v1 - Windows 10

Earliest version tested
12.1v1 - Windows 10 - This issue appears to be in all versions of the product

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