I saved 1 frame in Snowy Mountain then lost it luck-manipulating Walrus. however I saved the 2 frames previously spent on manpulation and 16 more in Walrus fight, and lost 1 for getting the glitch warp to work.
Many levels have been tweaked for entertainment while saving no time. (So your previous savestates won't work and you'll have to watch over again.)
The result is a
run 17 frames faster. I'll submit it when I determine that no more frames can be saved.
EDIT: I have no idea what affects the GO warp glitch. It appears to me that all the 3 warp glitches ie. Prison skip, Pelicon fight/Sister chase "Return to Title" and Walrus GO warp, are caused by the same programming flaw:
a fadeout timer or something similar is misinterpreted as the target level/scene ID when you somehow interrupt the current fadeout with another level/screen transition. However only Walrus GO warp seems unreliable.
EDIT2: It turned out to me that all of the warp glitches are resulted from the simple kind of programming error that the "current level" counter (03000B50) gets modified unexpectedly.