I’ve personally found that weaving is definitely faster, but you have to be strategic about it. If there are three or more lanes, often people will weave between the two left-most lanes (right-most if you live in one of those weird countries where people drive the wrong way), thus clogging up those lanes. I find that if you stick to the ‘slowest’ lane you actually end up going faster, especially on highways because there are cars in that lane trying to get off and clearing space in front as you go. This falls apart when you have a very busy exit, but usually you can avoid it by looking at traffic on waze or google maps.