When using XPlane 11 my i7 processor is constantly reaching its limiting temperature, 100°C, and then slows everything down until the temperature drops a little and then runs normally until the temperature rises again, all this within a few seconds of each other. I have to wonder then, is Xplane using the CPU instead of the GPU, for whatever reason?
System Details 2017 i7 27" iMac with retina screen, 48Gb RAM, 2.12 SSD/HDD with 1.2 Gb available, Radeon pro 580 GPU