This Seeking Tech article compares the two graphical modes of Spider-Man Remastered when playing on the PlayStation 5 Pro: Fidelity and Performance Pro.
You can find the comparison below:
Fidelity runs at 30 frames per second in a higher resolution. It may also show more pedestrians walking on the streets.
Performance Pro runs at 60 frames per second at a lower resolution. However, this mode uses PlayStation Spectral Super Resolution (PSSR) to increase image quality.
Ray-Tracing, included reflections, are included in both of the modes.