I dont see the amount of increas that you do, but I do see some.. It appears to me that the increase is due mostly to serviceing the dax signal level metering. With the RX slices DAX selections all set to none ( i.e. no metering activity ) l see no increase with Control panel active..
That leads me to believe that its mostly graphic rendeing of the meters that is consuming the CPU cycles.. Possibly theDAX metering update rate should be reduced ( ??? )