Quote -  Those manual settings are interesting. Specifically:

-Does min shading rate affect texture maps? In my experience, no, only procedurals. A shading rate of 0.10?! Egads, this content creator has oodles of time on their hands. 
.

yes Min shading does affect texture maps. lower the shading rate, sharper the map renders. I found that out from BB.

and no. render times increase but not massively.