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I am running a 580 sli 980x rig and I still 40-50fps in heated moments (sometimes lower!) I found there to be a couple settings I could adjust that sitll made the game look amazing, but just ran so much smoother.
Animation - High
AA - None
Enviroment - High
LOD Distance - High
Reflections - Terrain & sky
Textures - High
Render sampling - Superspample
Shadows - Medium
Shaders - Medium (By the far the BIGGESt increase, from 70-90+fps just from switching it from high to medium)
Post Processing - High
Best Texture Flitering applied
Deth blur - Disabled
High Res Character Textures - Enabled
Vertical Sync - Disabled
Also adjust camera roatation speed further to the right for a more smoother camera transition.
Hope this helps guys : )