What system are you on? Because XBox One and PS4 have had very good framerate patches. PC runs great depending on system/settings.
The only frame rate issue I currently know of is the slow camera stutter and the cut scene (animated intro) stutters. Is that what you mean? From what I understand, Xbox One is vastly improved since the 30 fps lock and PS4 is pretty good too.
Playing on Ps4, and no the game is not smooth on PS4. I beat the game and the last battle did bleed my eyes with horible 15-20fps with extra stutters included...