For those getting FPS issues, maybe try lowering your sound channels down an option. Might seem weird, but it helped me for areas like Dreadpools. There are still some stutter prone sections, though, like Rakkis, the magma parts of A3, and some A4 zones. Engine's honestly shit, however. I'd kill for opacity options on other player skills so I can actually see fights. Doubly so for elite ground affixes.