If I run WD Discovery, eventually my CPU usage starts going up and up, to as high as 100%. If I quit WD Discovery, CPU usage goes back to normal. This happens eventually, sometimes sooner, sometimes later. Whether I have a portable hard drive plugged in or not makes little difference.
WD Drive Service/WD Drive Manager uses most of this CPU when this happens.
I have an i5 PC with Windows 10 64 bit, fully up to date.