This game is extremely different to most other games in regards to system usage. I have Ryzen 1600x, 64Gb of RAM, a 1080TI, a 3440x1440 gaming monitor, a custom loop liquid cooling system, and everything is overclocked to their limit. I tend to run some stuff on the ultra settings and other things turned down for performance. My usage is never pegged on either the GPU or the CPU (even individual cores). My RAM usage suggest a memory leak but that's something else. What I figure, is that the game is heavy of the cpu cache. A cpu upgrade might help, but you're going to need to determine just what's worth it for you. A small upgrade wouldn't be worth it in my book. Typically a single gen cpu upgrade might only benefit you by single digit fps boosts if at all. If you're going from an intel 4-6th Gen cpu to a 10-12th gen, yeah that might be more worth it. This is all assuming your GPU usage isn't the issue. If your bottleneck is in the GPU, upgrading your cpu is just a waste.