As for performance, you said fine which can mean a lot of different things to different people. Do you have constant 60FPS in the game? Even on Plains of Strife when fighting 20 enemies at same time?
Yes, getting 55-60 FPS everywhere. When fighting so many enemies, there IS a slowdown as the game goes down to 40-45 FPS, but it's still playable. I kill a few enemies and the FPS goes up. Seems like optimization problem (LOD related?) but nothing that has resulted in unplayable game or resulted in a crash (for me, personally). Then again, I am using 660Ti, it's ancient so I am guessing people with better GPU's, like 970, will not be having such slowdowns so the problem could be just the GPU not being able to render so many enemies on-screen.
That's PC gaming for you. Unpredictable performance for everyone.