Inconsistent fps between graphics settings

Start off by saying ive got low-mid pc at best, geforce 970, an old i7 and only 6gb of ram (yes i know i’m between the min and recommended specs).

Typically get 50-60ish fps on mostly low settings with medium character textures. Get real drops but usually im around 50 on the better optimised maps.

Tried out extreme to make a point to my gf and somehow im only losing another 10 fps, now averaging 40-50.

Not sure what to say, usually i find a much, much larger performance gap between low and extreme settings. I didnt expect to get 20 fps on extreme let alone 40.

Any thoughts?

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