<ul data-eligibleForWebStory="true">Day 9 of the FastAPI Zero to Hero series explores Async Programming, a powerful tool in web development.Async programming allows programs to continue working on other tasks while waiting for slow operations.In FastAPI, using async functions enables managing numerous requests concurrently and optimizing server resources.A comparison between synchronous and asynchronous code in FastAPI highlights the efficiency and scalability of async programming.Async programming is beneficial for interacting with external services, improving response times, and scalability.By simulating delayed external API calls, the article demonstrates how async programming in FastAPI can significantly enhance performance.Async programming in FastAPI is recommended for tasks like calling external APIs, fetching data with async drivers, and network I/O.The article concludes that async programming is a game-changer for creating scalable and responsive online APIs.Async programming can greatly enhance backend performance and user experience in various applications.The article is eligible for web story generation as it provides concise insights into utilizing Async Programming in FastAPI for improved performance.