To retport system load for GPU-enhanced systems, provide a screenshot of Performance Tab of Windows Task Manager.  Make sure to select one of the GPUs and change the "Video Encode" graph to "Cuda".

The annotation in the Video Decode graph is to show how the GPU load varies significantly with video resolution.  An 8MP (4k) video takes up much more resources on the card then 2MP video. Also, GPUs are separated into different processors and video decode becomes the limiting factor for video 4MP and higher.