I agree it is possible that Firefly is running after closing Poser. This is the direction I wanted to investigate.

But I can't. I need to see a complete process list before, during, and after running Poser, and in the "after" case, when you've closed Poser but your system is still slow, I'm interested specifically in seeing what process is using near 100% CPU. If it is FFRender, then we go one direction. If it is something else, we go another direction. If nothing is using up CPU, then we go a third direction.

There is absolutely nothing interesting about seeing Poser or FFRender using a lot of CPU during rendering. This is not worth studying, and it is wrong/naive/ignorant to blame Poser for using your CPU well. It was my chief complaint before Poser 8 and that Poser did not use my CPU well - now it does 100% for real, and that's excellent. Either live with it, or learn to lower the process priority. It's a simple setting that changes how your OS manages CPU, and it isn't the program's responsibility to manage how it shares resources with other apps. That is the responsibility of the OS and the user.

If, after quitting Poser, it is still running and using lots of CPU, that's an interesting problem, but not particularly amazing, assuming it is FFRender that's still running, not Poser. I need to see this case.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)