Just an observation which I can't test but others might be able to contribute to; The render time issue for my system between my old GTX 970 and the new RTX 2070 matches the calculation times if the number of processors in the RTX is halved. Perhaps there is something in the architecture that is having Poser only see half the cores. I know my system checking software (Speccy) only sees half the memory, whereas the benchmarking software sees all of it.

Maybe the others having slowdowns could do a time to render check and compare the results with their older cards as if the Turing cards have only half the listed cores?

Anyway, like I said, just a random observation. Could just be a coincidence.

P