After giving it some thought, I believe I found the way to make a tortilla quicker but still good. I was wondering which steps of the process can be improved or automatised and I came out with a couple of ideas. So here we go.

For a 4 people tortilla, you need :

4 eggs, 1kg potatoes, pinch of salt, olive oil and depending on your taste you can add one onions and one green pepper (it is also nice only with potatoes)

Peel the potatoes and cut them in thin slices with a mandoline (this is much faster than doing it by hand). If you want to use the onion and the pepper, cut them also with the mandoline in small pieces. Fry the potatoes in a fryer and the onion and pepper in a pan. Once the potatoes are ready, mix them with the eggs in a bowl and add the fried onion and pepper also. If you think you have too many potatoes and the mix is too thick you can always add another egg or a bit of milk. Add some salt.

Finally put the mix in a non-stick pan with a bit of oil and let it cook slowly. With a fork or other utensil you can check when is it ready to be turn to the other side. You can easily do this with a plate or a lid of the same (better a bit bigger) diameter than the pan. After a few minutes your tortilla will be ready to eat.

Buen provecho!