Robby
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I can reproduce a significant FPS drop, but only with my Carenado planes. I start with very good FPS cold and dark, but performance drops by around 10-20 FPS (!) once I start the engine. If I turn the engine off again, FPS is recovering. This does not happen with the default X-Plane C172. Machine is i7-2700K @4.9GHz, GTX 770 4GB, 16 GB Ram
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Yes, that's usually the case. Windows changes the core for execution of a thread many times per second. That's the reason why you see the distribution of the load to several cores. I agree that this is misleading in the task manager visualization, but in most cases, there is one very demanding X-Plane thread involved that's the bottleneck.
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You have twelve cores. If the CPU load is at 12, this indicates that one thread is maxing your CPU. So, it seems that the most demanding thread in X-Plane is limiting your performance on your CPU.