Loaded default scene, using 11.2.309 (latest beta build). No material or lighting changes - as the log shows, I have started Poser, adjusted the render settings to those posted above (except bucket size as I don't have a suitable card for GPU so I'm CPU only) and then hit the render button.

No point posting the render, it's the same. Here's the log -

So the 1080Ti results are way off.

I would note that Superfly has not had any significant update since P11 was released back in late 2015 IIRC. I used to render on a GTX 660Ti which was released in 2012 and got times around 20% faster than my CPU. The 1080Ti was released in 2017 according to Wiki, so I suspect that Superfly simply does not work well with later GPU's where the architecture has changed. This has been the case with Octane Render; every time a new round of Nvidia GPU's has been released the software had to be updated to work properly with it.

What about CPU results?

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