Better hull shape, better craftsmanship, sourcing materials from far away, industrial production (https://en.wikipedia.org/wiki/Economic_history_of_the_Nether...: “The shipbuilding district of Zaan, near Amsterdam, became one of the world's earliest known industrialized areas, with around 900 wind-powered sawmills at the end of the 17th century. By the early 17th century Dutch shipyards were producing a large number of ships to a standard design, allowing extensive division of labour, a specialization which further reduced unit costs”)