Memory Use

Your pic is of CPU usage, not memory. And, it does not appear bad at al. I have an AMD 7 2700 and see that kind of usage on all 16 cores.
 
Yes, in addition to GPU, I have noticed Trainz being very intense with CPU, so needs a lot of horsepower both ways. I think GPU gets the graphics, but CPU gets most of the heavy hauling for data and database. I have a quad core, but never imagined it would peg 16 cores!
 
I am not pegging them, but over 50% on all of them at once is normal. I have never played with any of the built-in routes......I build my own layout. No AI is used, but lots of trains running through thousands and thousands of good looking trees evidently uses a lot of CPU time.

I was always amazed when people here always talked about the GPU having everything to do with FPS, but never mentioned the CPU at all. I just assumed that the built-in routes were quite different from my homemade ones.
 
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