Sorry to be "that" guy, but wouldn't an animated displacement texture be a more straightforward solution?

https://www.renderosity.com/forums/threads/2901601

So the problem is you want wrinkles to go along with a smile morph. (Or think how the soles of your feet wrinkle when you bend them. So far no Poser figure has yet solved that problem.)

So just ERC link a displacement map to the smile morph, and that's that.

It won't show in preview, but most people don't care about a "nice" preview, anyway.

(I'm one of the few who really, really LOVE a "nice" preview, so I'd more than happily see subdivision work properly in Poser without slowing my machine down to a crawl)

In my experience, subdivision makes the Morphbrush jerky and unresponsive very quickly, and you need quite a bit of it to create really convincing wrinkles.

I'm enjoying this thread, even if I don't understand ALL of it. ;-)

But from a practical point of view, as long as Poser's subdivision doesn't run as effortlessly as it does in ZBrush, wouldn't it be better to use it only in a scenario where it is "less harmfull" to the user experience?