In the USA, as far as I am aware there is little concept of performance.
Company SOP's differ between the GOM and the North Sea do they?
Same company....same aircraft.....some kind of task....but different Standards?
Sometimes i wonder how we ever manage to survive in the USA....considering just how little we seem to know about helicopter flying as thought by some here.
HC....there is a huge difference between "Knowing" and "Doing"....and some Operators might ignore the EASA concepts of PC1 and all that....or as in the old days....Cat A.
But oddly, times do change even in the good ol' USA.