A CPU is like a supervisor in a computer, guiding the graphics card to perform certain tasks while gaming. It passes the gaming instructions to the GPU that executes and shows visuals on the monitor. Suppose there is a low-speed CPU in your system. In such a case, it will take much more time than what is necessary to pass the instruction to the GPU. So the card won’t be able to showcase enough resolution, fps, and refresh rate. This is how a CPU affects FPS while gaming.