I am a novice sailor (at best) and natively German-speaking, so the question might contain incorrect use of sailing terms and further misconceptions - thanks for any pointers in comments.
In high wind it's clear: You lean out over the side of the boat to help keep it upright. In lower wind, there seems to be two counteracting effects regarding speed:
- More heel (not/less leaning out): Second hull has no/less water contact -> less friction.
- Less heel (more leaning out): More effective sail area towards the wind (better angle).
Are these statements even correct? And if they are, which is more important? And/Or are there other (more important) effects I didn't think of?