The text discusses the migration of a large, open-source React application to use Next.js, with the goal of improving developer experience and performance. The BBC website is used as an example of such an application, which was initially built using a custom React solution. The authors aim to show how to incrementally adopt Next.js and Vercel, leveraging existing code and minimizing unnecessary changes. They start by setting up a new repository with two clones: one for the original application and another for testing Next.js changes. The process involves removing unnecessary dependencies, configuring Next.js, and deploying the changes to Vercel. Through this journey, they demonstrate how much code can be eliminated or replaced using Next.js, reducing maintenance efforts and improving developer experience. The authors conclude that Next.js enables teams to focus on their product and customers instead of application infrastructure, allowing them to do their best work at the moment of inspiration.