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Gatsby JS is a static site generator that is used to create high performance websites. Built on top of React, it weaves together some of the better parts of GraphQL, react-router and webpack for a brilliant developer experience. This means a much faster site, taking a lot less time to build! The BBC lost 10% of users for every additional second the website took to load. The Trainline reduced their website load time by 0.3 seconds and in doing so their revenue increased by an extra £8 million a year.