This Seeking Tech article compares the Fidelity Pro vs. Performance Pro graphical modes of the PS5 Pro version of Ratchet & Clank Rift Apart.
You can find the video below:
The Fidelity Pro mode limits the frame rate to 30 fps but at a higher resolution. It also features a full array of ray-tracing features, including some not found on the base PS5. The lighting, visual effects and crowd density are also better when compared to the Performance Pro mode.
With Performance Pro, the game targets 60 fps at a lower resolution. It uses PlayStation Spectral Super Resolution (PSSR) to improve image quality. All the ray-tracing features found in the base PS5 version are included in this mode. However, the new ray-tracing elements from the Fidelity pro mode are absent.