Performance in the main game is good varying from 40-60 fps depending on the area.

However performance in part 2 of the Power Awakens is very poor. It introduced horde battles which hover around 25-30 fps with frequent dips to sub 20. Some of the cutscenes do a split screen effect and they drop to 15 fps whenever it is going on.

The DLC itself is pretty short being only a few battles so I didn't bother finding optimal settings exclusively for this bit of content but something to keep in mind.