Ok you probably know in PAL version there's an option to skip nice transition between levels.

No option like this in NTSC-J version. But there's a trick. If you press Start>Down>Attack>Attack the screen will change to menu after the level is done. To quit this you just tap "Right".

I recorded the comparison.

Ok. this might be known but I don't see anyone uses this technique. I guess it should not be prohibited because it's all in-game mechanic. The best scenario it may save up to 25 seconds of a full game depending on how fast you do the trick.

Created this thread just to be sure if mods accept this kind of stuff or not. Also to announce it to players.

I see no reason to disallow this trick.

Good work finding this and thanks for sharing.