I noticed my duplicates do the most weird-ass pathing calculation I've seen in my entire life. They always, without fail, stop near the airlock I built next to a ladder just to hop on and off it. Because of this, it takes them forever to get anywhere while the airlock cycles back and forth, letting out gasses as a side-effect. Example of what I mean in the attached video
Build ladder, build base tile with airlock next to it, dupes will calculate it's faster to use the ladder+tile speed bonus, disregarding the cycle time of the airlock completely.