I'm ignorant and don't finish, but I want you to tell me the difference between these 2 systems in speedrun. Why is JPN/NTSC slow? I don't finish by translation.

The Japanese version has slightly longer loading screens, by about 0.3 seconds on average.

Only an average of 0.3 seconds?

0.3 seconds per loading screen spread across dozens of loading screens would add up pretty quickly. 25 levels + 5 bosses = 30 entry loading screens, 29 exit. That comes out to ~18 seconds lost to loading screens. Not much time, but enough to really matter at the top levels of play.

Thank you very much! I'm very happy because I understand that a record still establisheds! I exert myself!