Gatsby has introduced an innovative approach called Reactive Site Generation (RSG) that significantly accelerates the process of updating content on websites by leveraging reactive programming principles. This advancement allows Gatsby Cloud to publish updates to its content delivery network (CDN) in approximately one second, a process that is about 100 times faster than traditional Static Site Generators (SSG) hosted on platforms like Netlify. RSG utilizes a real-time data layer fed by GraphQL and enables instant updates to the CDN cache, ensuring that changes from a content management system or ecommerce backend are reflected almost immediately. Benchmarks show that RSG outperforms SSG and compares favorably with Server-Side Rendering (SSR) methods like maxAge caching and stale-while-revalidate techniques. By focusing on reactive builds, Gatsby has constructed a more efficient framework that can handle rapid data changes, making it especially beneficial for sites that require real-time updates, such as news portals and ecommerce platforms. This development marks a significant milestone in Gatsby's evolution from its beginnings as a React meta-framework to a comprehensive solution for building fast, scalable websites.