I added a few splits and messed with current splits before attempting another run, so It's kind of hard to tell how much I improved in certain splits. Although, I can say that while my early game wasn't as good as my last uploaded attempt, and the King fight wasn't was pretty bad compared to my previous one, my Jevil fight was so heavily improved that it allowed me to improve my time by over a minute! (At least, I'm pretty sure that's the reason).
About a month ago, there was a community poll held in the discord to add IGT to Deltarune. After a close poll of about 70 to 5, we have added the use of IGT to the game. This IGT only makes a difference to the All Chapters categories, removing the time spent switching between chapter 1 and chapter 2