Hi,maybe someone can help me with this.

I play crysis with dx11 enabled HighRes PAck,Maldo Textures and Settings on Ultra.Its playable with some Lags in heavy situations.
If i set Shading to Extreme Performence get a lot better and i dont see any visual differnece excpet RealTime Reflections.
So where is the differnece from Ultra to Extreme Shading Settings?
Maybe someone can post a Screenshot so i can see a differnece cause i cant find any.

ultra shaders have all details they can. extrem not. try by yourself, search in ultra settings a very detailed shadow, change to extrem and see.
no great difference at all.
i always see no great difference from extrem to ultra, except tesseleation (on or off;)

There is a different but you might not notice it. Effects are probably done in higher detail or precision. The simple fact is, if you cannot tell the difference, take the one with the higher frame rate.