More jets will mean more solution used unless you make them smaller like suggested , on a portable it means more filling and emptying so if you think a bigger wand will make you clean quicker it might be the opposite as you will spend more time Filling & emptying.
I've been using a 10 inch wand with a single jet on bedrooms and I find it clean just as well as my big wand, I've even used it on big rooms and considering its 20% smaller than a normal wand I don't find it a lot slower.