0% GPU Usage on iMac 2019 with Radeon Pro 560x, help!
It may well be a software bug that Activity Monitor and other tools don't report any GPU usage. Alternatively, exactly what GPU% is measuring may be not what we think. Obviously, the GPU is doing something. You may get additional information in Activity Monitor &gt; Window &gt; GPU History.
My 2014 MBP with an integrated graphics unit also reports 0% GPU on every process. I can just get WindowServer to report 5% by scrolling a window like mad for several seconds.
From the spec, your 2019 has only the discrete Radeon GPU (since it doesn't need to fall back to a lower-power integrated unit like a laptop). So it has to be using the GPU if you're seeing stuff on the screen.
If you're not seeing any actual problems with the display, or performance issues with 'heavy' graphics tasks, then I'd say there's nothing to worry about.
Bear in mind that a lot of common tasks are actually trivial for modern hardware these days.
&quot;Looking at data on what the OS is doing always leads to worry about whether it's the right numbers.&quot; ;-)