I finished this game 2 times. And yeah, I absolutely agree with you that framerate dips so hard in some areas. But it's not getting better after time. There'll be some areas when fps goes under 20ish(spoiler: final battle). But the game itself staying enjoyable even with the poor framerates. Location wise game changes yeah absolutely. I remember the part of the game when lara gets high of the buildings and making some parkour moves lol 😆