Interesting. It appears that lowering the minimum shading rate actually makes the artifacts look *worse*—more pronounced and distinct—at least with these settings.

Of course, they might also go away altogether if I crank Irradiance Caching. But at the moment I'm aiming for something usable for medium quality renders.

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Hardware: AMD Ryzen 9 3900X/MSI MAG570 Tomahawk X570/Zotac Geforce GTX 1650 Super 4GB/32GB OLOy RAM

Software: Windows 10 Professional/Poser Pro 11/Photoshop/Postworkshop 3