I am not happy about this. (gg tho)

I'm having a lot of fun on this speedrun and I managed to get all the way to 3rd place (still getting verified, how long is this supposed to take?), but I still don't get the pausing that's done in the #1 speedrun. Whenever they enter any doorway ,they seem to pause, so that the transition doesn't take any time on the timer. But for some reason I just can't pause during those moments. Any tips on how this works?