@nerd:  The Superfly render settings in the P13 documentation which HartyBart provided has bucket size specified and progressive refinement ticked.  It shows the render device as being an RTX 4070 Ti.  Is the bucket size irrelevant if using progressive refinement?

@RedPhantom:  Do you mean 2048 as bucket size for GPU rendering?  I intend to render at larger pixel size (4K, i.e., 3840x2160 pixels), with scenes of similar complexity/difficulty as yours.  On the other hand, this GPU has more VRAM (32GB).  Does anyone know of a way to monitor VRAM usage in real time? 

With some trouble, yesterday I succeeded in routing the HDMI and optical audio cables from the workstation room (second floor, front of house) to the home theatre system (downstairs, center of house).  This PC chassis has two currently empty 2.5" laptop drive bays.  I think I'll get a couple of 2.5" internal SSD for use as archival closet storage.

Poser 12, Poser 13, Poser 14, in feet.  

OSes:  Win7Prox64, Win7Ultx64, Win11

Silo Pro 2.5.6 64bit, Silo 2025.1, Vue Infinite 2014.7, Genetica 4.0 Studio, UV Mapper Pro, UV Layout Pro, PhotoImpact X3, GIF Animator 5