Can someone explain to me what each setting in the advance graphics menu does, please? Like what it disables on each "tier"

-Game Effects
-Object (I think this changes tessellation, view distance?)
-Particles (does this affect particle shadowing? That really hurts my framerate > .<)
-Post Processing (I think this affected the antialiasing quality in Crysis 2)
-Shading (GI?)
-Shadows
-Water (I know what this does)

I wanna know which affects I can turn off to save some FPS =P

Thanks