So... I went from XYPlorer 9.10.0000 to 9.10.0009 and note that maximized or minimized to the taskbar, XYPlorer is pretty much solid at 00% of my CPU. I changed folders, changed preview to a pdf, changed back to a jpg and the worst "blip" I saw as up to 31% as the pdf preview opened, but it lasted for about 5 seconds, if that and settled back down to 00%, where it remains.
Overall, looking at this makes me wonder if I shouldn't be using XYplorer MORE than I do now (I have DOPus 9 set up as my default) as it seems much lighter...