Render uses only half CPU cores

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Hi,

I have Threadripper 1950X(16C/32T) and renderer uses only half cores/threads.

In "msconfig"(Win + R) all cores are enabled.

I have to enable all cores for renderer application in task manager(TM -> RenderProcess.exe(right click) -> Set Affinity). That enables all cores for the process but after render is done, CPU affinity is reset to half cores(without closing Fusion).

Render is done on PCB 3D model(high quality when pushing from 2D PCB).