From what I recall theres only a few essentially tacked on "physx" levels in the game, a warehouse, a glass wall, and a shack that gets shot up, thats about it.
Worthless having it, its been purposefully crippled in performance pretending to be "realistic" destruction when you can blatantly see with the glass exploding effect that its a prebaked effect, thats not realistic, shouldn't cost any performance yet does, its Nvidia playing games to get you to pay Nvidia more money.
You can either ignore it, or pay Nvidia money, which will encourage them to continue screwing us over.
Look up the video's of the physx effects in the game, a bullet will hit the glass, physx's whole schtick is that it offers realistic effects, more particles and more realism, you can see that the bullet "hits" the glass, theres a delay, then the same identical exploding bits of glass each time. Thats the kind of crappy, non performance hogging effect thats been used for 10 years, but Physx somehow kills performance and pretends its realistic realtime effects.
Physx is a joke, ignore it.