One of the tricks I've used for a long time to speed windows machines up is to boot off a utility disk and delete pagefile.sys swapfile.sys and hiberfil.sys These files are *always* locked by windows and never get defragged and can quickly become the most heavily fragmented and corrupt files on the system.
I've done it this way because in my experience setting windows to clear the paging file at shutdown made it take much longer to shut down or reboot.. but this was back in the era of windows 7. Is this still the case in windows 10? and if so is there a utility that will clear the paging file *once* at the next reboot? I do more work remotely now and booting off something else doesn't work very well remotely!