Is it just me or has Performance been improved?

So I’m on PC and despite having a PC good enough to run the game, I choose to run the game on Low setting for the sake of Frames. Despite this, I was getting 100 to 120 FPS. I just noticed tonight as I was finishing the campaign, that the game was now hitting 140 FPS. I can only do 144 FPS with my monitor at 1440p but it looks to me as if 343i is improving the game so it’s easier to run. If this continues I might even up the game to Medium settings.