Compared to the previous beta releases of the game, I'm glad to see that the performance issues have been dealt with. Been getting some stunning fps so far, so glad they fixed that.
I only played the first beta weekend and things have definitely improved visually and performance wise. I only really played elemental and thief, I'm someone that tends to play a class until I find one I love then stick with it. Tried thief at first as I was really underwhelmed by the damage output and how easily he died. Elemental was far easier to play and not much has changed in release.
I've found that Ultra shadows and super sampling re the most taxing options. Turning them both on using my set-up knocked off 20 fps straight away!