artbee, I'm using SR4. I don't see any improvement. But perhaps the improvements are in different conditions.

Now, to your point, no: the artifacts are not from specularity, at least not in isolation from IDL. They are from IDL. I know this, because they disappear if I don't render with IDL, just raytracing. But of course I don't want to do that, since in every other way IDL looks infinitely better.

______________

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