I haven't had framerate issues, but I did notice that sound has been acting up since the last patch or two. It seems fine, but then during a ground battle, many sound effects are missing, and sometimes graphics are missing too. I've had room contents not appear until I actually pass the threshold. That is, standing outside the room, all I see is a black wall in front of me. I can see NOTHING in the room until I actually start entering, at which point the graphics are displayed.

It clears up eventually for me, but is a bit annoying.