- 4-2: 10 frames saved
- 4-3 3rd screen: 8 frames lost but kept 8 frames total (worse beginning, better ending)
- 4-3 last screen: 2 frames saved
- 4-4 (boss): 3 frames saved by better jumping and positioning.
- and 3 frames from timer rule
(5-1 starts 16 frames earlier now)
4-2 3rd screen trick is letting the first guy shoot all his (3) bullets to the right side, so going as fast as possible will won't let an enemy spawn, saving tons of frames. Pretty subpos dependable...