Render emails server-side using Bun and React for fast performance. Bun is an all-in-one runtime for JavaScript that comes with a bundler, test runner, and package manager. It's faster than Node.js and Deno, making it suitable for edge computing tasks such as sending emails via background jobs in edge functions. By utilizing Bun's speed, developers can send emails using React Email templates, which provides a more engaging experience for users. The project showcases the integration of Bun with Resend to send emails server-side, allowing developers to build fast and efficient email systems.