I mean, it probably doesnt matter in Renpy games.Wtf did I just read? There is no such thing as problems related to speed mismatch between CPU and GPU.
But it is true that if GPU is way faster than the CPU can keep up, you get bottlenecks, so you do not have full potential of your GPU, CPU is limiting it.
For example, i had my CPU working constant 100% while my GPU was slacking off at 70%, it was too easy for him. Now that i have better CPU, my GPU is at 100% as it should be and CPU between 50-70%, thats what you wanna see
I had this problem with Cyberpunk and i bought faster CPU and problem got fixed, they both work pretty much close in performance so theres no problem