Noted.  Thank you, HartyBart.  I scanned through that web page.  Remaining question:   Should I choose bucket size such that it is an integer exponential power of 2?  (i.e., 2,4,8,16,32,64,128,256,512...)

Again, I will mostly render GPU/Optix in superfly at 4K resolution.

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