Today I wanted to observe the consumption of resources that the simulator has, and I could not believe what I was seeing. Only in the menu, the use of hardware has seemed totally excessive
Most people find capping the frame rate in NVidia settings to alleviate this works very well.
It works, thank you very much for the advice
see this one
( and dont forget to Vote ) 
Could this simply be that the simulator has preloaded a heap of functionality in memory and GPU allocation to minimise loading times?
I only mention this as it is how software tends to be built when building high performing systems.