Gatsbygram is an Instagram clone built using Gatsby v1, a JavaScript web framework designed for creating fast, dynamic, mobile-ready websites by combining the benefits of static site performance with the capabilities of React.js. It significantly outperforms the real Instagram site in speed tests, especially under conditions typical for budget smartphones with unreliable networks. Gatsby utilizes modern web performance strategies like PRPL to maintain functionality regardless of network quality and simplifies website development through its framework and plugins. The project showcases Gatsby's ability to programmatically define routes using data and demonstrates its use of React.js components for rendering pages, along with a GraphQL schema for data querying. Gatsbygram employs CSS-in-JS libraries like Typography.js and Glamor to enhance design flexibility and performance by automatically optimizing and inlining critical CSS. The setup for creating a personal Gatsbygram site involves cloning the Gatsby repository, scraping Instagram data, and leveraging Gatsby's plugins and APIs to generate a responsive, optimized site.