- 4-1: 2 frames saved by changing subposes and route. Final birdy still unoptimal.
If everything would be perfect, Ryu would just jump twice in a row at the end and get hit by bird for 9 frames, so the Y boosts will be 3*5 + 2*4 + 2 (= 25) + final jump.
Highest jump peak is 128 while target "level end" is at 84. So, you can't finish the level without jumping after boost (128-25 > 84).
For comparison, this movie sacrifices
- 2*1.5px (avoidable, used to manipulate birdy X position speed)
- 1.5px (next to last ledge, but otherwise birdy has worse Y pos... maybe unavoidable?)
- 1.5px (final ledge, depends on route to avoid it)
- 3~4 frames longer from best (9~10) boost