Provide a screenshot of the tasks in the Windows task manager, ordered by the most cpu time used .
Also after an image is widows 10 applying updates. I have seen it take 12 ++ hours to update a PC after a new image.
Check hardware acceleration and check direct to disc.... otherwise perform a clean install of windows...still not ebenou information..what cpu what resolution cams fps etc
remove the radeon video card and make sure hardware acceleration is actually working if your processor supports it. always perform a clean windows install...imagining may cause problems.