Your experience may vary, but on my system, using my nvidia RTX2080Ti, there's a HUGE slowdown in computing, when I compare the same scene computed with Poser 13.0.339 and this new 13.1.449 version, at least when ScatterVolume is used.

Here's the scene:

Kalewksi's RKDungean3, a vase using a procedural material, 4 spheres on the ceiling + 1 in the vase (light emitters), a smoke object and a huge cube (using ScetterVolume as I still don't understand how to correctly use the new PrincipledVolume).

The settings I've used are the default "OptiX high" except that the pixel samples are set to 20 instead of 25 and the bucket size set to 2048

Size:915x973

Poser 13.0.339: ~45 seconds using OptiX and ~59 seconds using GeForce
Poser 13.1.449: ~211 seconds using OptiX and ~264 seconds using GeForce 

Without the Fog cube and the Smoke objects (both ScatterVolume)  both Poser are computing the scene below 15".

I've found a culprit: the Clouds node, avoidable using the new PrincipledBSDF.
Using these settings:

I like the new smoke, more convincing 

Great find, saving that matsetup. Thank you!

Rhia474 posted at 1:29 PM Sun, 20 August 2023 - #4473125

Great find, saving that matsetup. Thank you!

How you create the smoke... or where to buy ? sorry out topic.

petrusvitus posted at 2:33 AM Fri, 8 September 2023 - #4474223

How you create the smoke... or where to buy ? sorry out topic.

Thanks for the info. That smoke can be animating in poser? 

petrusvitus posted at 5:53 AM Fri, 8 September 2023 - #4474230

Thanks for the info. That smoke can be animating in poser? 

I  see. how do you make the material. Can you share screen shot. Thanks in advance..

I really don't master correctly Poser13's new PrincipledVolume, but here an example to start with

The bright contrast node helps me to have the same color but darker
If the emission strength is too high, you'll end up with nothing to see

In the example below, I've setup a vase with a strong blue source spot (1000%)

Thanks for share.. Now I can make cloud with it.

Cool