I built a PC specifically for transcoding raw footage to proxies based around a 16 core Ryzen 9 3950X. I have noticed when transcoding I am often getting less than 20% usage on my CPU. When I was using an i9 9900K I frequently sat between 90 and 100%. Is there a way to fix this?
CPU usage while transcoding in Kyno broadly depends on two factors:
Of course there are other possible bottlenecks like disk i/o speed, but it doesn't sound like that's a factor in your case.
You can adjust 1) under Kyno or Help - Preferences - Conversion - Maximum parallel conversions. You can play around with that value to find the optimal usage for your set of files.