Not sure how this would help in a speed run, but please let me know what you think.

Note: I found this while doing a puzzle the wrong way.

This is for the Divine Beast on Death Mountain and on the door with the window portal that normally you have to light the torch on the other side by shooting an arrow lit with a blue flame. (I thought i had to throw the torch through lol)

When you're at that door you can do the following:

1. put the dungeon on the side
2. go up to the door and Link will climb the door portal like its a ledge, but to stay on it, you have to keep walking toward the door.
3. go into a crawl position and move forward and you clip through the door. You can do the same thing to get back out the door on the other side. (that part is nice)

I think in the end, it might still be easier to shoot a lit arrow through the door, but this is something that can be done too.