[praptak]

The elevator in the apartment building I currently live in has a quirk which adds ~2s to the travel. If you know this quirk you can save the ~2s on each use.

So if you just pick the floor then it waits 2 seconds before closing the door. Obviously the elevator waits for the door to get fully shut before it starts moving.

If you first press the "shut door" button and then the floor button, then the door shuts within any delays, which means the elevator starts moving 2 seconds earlier.

[AnssiH]

Interesting. Mine has an even longer delay than 2s (3-4s?) so I always press the close-doors button which removes the delay, but it never occurred to me I could shave some additional milliseconds off by pressing the close-doors button before the floor selection button.

[praptak]

In my case pressing the close-doors button after the floor button does not do anything - it is as if the floor button sets the timer on the doors, which then cannot be changed by the close-doors button.