Logic (simulation) is running on the CPU. And it's not the CPU that's running on 100%, even on an empty map. Sure, maybe they run some neural network on the GP

Logic (simulation) is running on the CPU. And it's not the CPU that's running on 100%, even on an empty map. Sure, maybe they run some neural network on the GPU (for ... pathfinding? or what?), but it's highly unlikely. And again, empty map. Yes, probably someone went rather overboard with GI and other shaders.