For working with millions of polygons/points/polylines, I notice that ArcPro hardly cracks 20% utilization of my i7-7700 8-thread processor for the vast majority of tools used. I work with millions of spatial bins and millions of GPS points, and would like to set ArcPro to utilize the most out of my processor.
depends on the tools you use
check your settings
and for GPU
so what tools are you using and what are your tool Environment settings when you run them