In a 64-bit operating system, your Poser 10 will be allowed to run with 32-bit constraints; it will only be allowed to use approximately 3.5 Gigs of RAM memory. I upgraded from Win 8.1 to Win 10 with PP2014 installed. I have no problems. Now I've upgraded to Poser 11 Pro and I still have no major issues. If you are experiencing application problems, I would recommend a re-installation; something may have become corrupted. If you believe your scenes are causing problems, then evaluate exactly what is on the stage to pinpoint what is causing the lag. But you need to post more information about your system and where issues are occurring. Screen capture your display and post it here. It is easier to show us an image than to explain what you see.