I've figured out you don't even need a ledge to do zips.. at least in this location it works.. And to great effect.. Cuts out 1094 frames, but this is a primitive version likely to be improvable?
Better ladder trick leads to 4 frames saved in Bell Castle 3. I think more could be squeezed out as I had inconsistent results on some stuff afterwards.
#47640901579624369 - Damage boost in first spike section FR3