Hra je nahovno
https://forums.geforce.com/default/topic/906363/ph ysx/mafia-ii-huge-fps-drops-with-physx/

The game is coded in this way. There are two effects in physx, particles and cloth simulation. The second one has the higher performance impact. But the game is coded this way, if not dedicated gpu for physx is detected, cloth simulation will run in the cpu no matter what. I mean, your gpu cuda cores can't run the physx cloth simulation if are into your main GPU. Is a game "bug".

You can:

- Install an old nvidia gpu as dedicated physx.
- Reduce cloth simulation detail editing a few files so your cpu will not be the bottleneck.