Effect Detail: With lots of bullets and other effect this will decrease FPS.Shader Detail: Edit: Now playing on laptop, and on low the skybox still shows.However, it is important to know that even with the shadow on lowest quality, you will still see player shadows very clearly! Lowering the shadow will not put you in any tactical disadvantage. Shadow: The shadow in this game is incredibly intensive and will pull your FPS down significantly.Leave it on if you are happy with your FPS or if you want to take screenshots or record a movie.
Soft Particles: With lots of bullets and other effect this will decrease FPS.You'll have to calculate for a huge performance drop if you're aiming through areas with high foliage FPS drops dramatically with higher Scope Detail. Medium is visually significantly better without too much performance drop.