Grimrock

Hey there!
I've encountered a problem with the timed puzzle in the deserted tunnels. No matter what I do, the wooden door is closing, before i can reach it.

I know theoraticly how to do it, press QQWD, release an arrow or throw a rock, strafe back to the wooden door without turning around and than one step back through the door.
I've even written a makro to klick the keys fast enough!

But the metal door is opening too slow. The wooden one closes again while the metal door isn't open yet, and i can't get through.
I've read that it would help to set all grafic settings to "low" to allow to move faster, but this won't help either. (And my PC is much above the requirements for LoG)

Is there anybody who knows what to do?

(ANd sorry for my bad english)

you can throw before the door is all the way open. you can step back an extra square before throwing to get a "head start" (IIRC)