Ok I know you can use Shift Key to run but what do you use to quickly skip the dialogue? What button to press?

I use Enter to quickly skip dialogues but it is not a convenient position for new speedrunners because you still have to move, I control the arrows with my left hand and with my right hand I mash Enter to quickly skip dialogues, it is not convenient but once you get used to it then it is effective

@Tegron I recently just saw Starsmiley run and he mash Z and X on the keyboard and it worked for me which is much faster than mashing Space or Enter. But I still don't know how to save 10 seconds more time for World Record.

spamming space is the trick (also left click is a good option in some games)