I just popped the disk in and let the intro play twice in a row. First time, it was very choppy and stuttered a lot. Second time, there were no problems; it ran very smoothly. The difference in framerate was very noticable, and I've noticed this happening since launch.
I know I know, nowhere near as important as this game's other problems. I'm just curious to see if I'm the only one who's experienced this.
This happens to me on both PS3 & Vita, btw.