Too lazy to post a room-by-room breakdown of frame counts. FODA's world 2 was pretty robust, though. (I'm calling it 'world', although it's probably a bad term for a cluster of approx. 20 rooms)
Notable differences include spending a potion to get rid of some massive lag, fetching two keys from secret walls and skipping one different key, and fetching a potion allowed by the spare key. I haven't really found any other convenient potions in my mapping, though. Killing that lag by potion apparently saved over three seconds.
Seems I'm getting closer to improving yet something else. Oh, how fun.