The Precision Proton Spectrometer (PPS) of the CMS and TOTEM experiments col-
lected 107.7 fb1 in proton-proton (pp) collisions at the LHC at 13 TeV (Run 2). This paper describes
the key features of the PPS alignment and optics calibrations, the proton reconstruction procedure,
as well as the detector efficiency and the performance of the PPS simulation. The reconstruction
and simulation are validated using a sample of (semi)exclusive dilepton events. The performance
of PPS has proven the feasibility of continuously operating a near-beam proton spectrometer at a
high luminosity hadron collider.