You are right that it could be a lot faster with a bigger rocket. There will be quite a few "slingshot" or gravity assist maneuvers along the way, it's not like

You are right that it could be a lot faster with a bigger rocket. There will be quite a few "slingshot" or gravity assist maneuvers along the way, it's not like they are blasting straight out to Jupiter orbit. https://upload.wikimedia.org/wikipedia/commons/b/bf/Animation_of_JUICE_around_Sun.gif https://upload.wikimedia.org/wikipedia/commons/b/bf/Animatio...