Why is Blender just using 54% of my CPU when rendering in cycles? Blender is only utilizing 54% on every core of my CPU (as shown in TaskManager) when rendering in Cycles. How can I make it use 100%?

Can this be fixed within Blender or is it more of an OS/hardware-related issue?
Try to changing the number of threads to the same amount of the CPU (in this case 10)?