Resolve Studio Using only One of my 2 Xeon CPUs

I've been constantly curious why my CPU utilization is so low when doing all sorts of intensive tasks in Resolve.

In this example, I'm playing a DCI 4K XAVC clip with Depth Map and camera blur effects, as well as a grade. The GPU is about 56% but half of my CPU cores are idle.

Does Resolve have a limit on the number of cores it will utilize? Or how can I tell Resolve I have dual CPUs?

Task Manager during 4K playback

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The thing I can't understand is when video playback stalls, the CPU and GPU utilization dip. I would expect them to max out, as in overload being the reason for the stutter/stalling. But it's the opposite.

Task Manager

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