Here is a summary of the text, covering key points in one paragraph: To improve performance in ASP.NET Core 3.1 Razor Pages applications built with the MVVM design pattern, making hot code paths asynchronous is crucial. This involves using asynchronous features of C#, ASP.NET Core, and Entity Framework Core to handle frequently called data-driven operations, such as Razor Pages controller actions and data access actions. By adding asynchronous methods to data repositories using async/await and Task<TResult>, developers can make these components asynchronous and improve the application's performance by utilizing threads more efficiently. Additionally, making PageModel action methods asynchronous allows for better utilization of the thread pool used in HTTP requests. The tutorial demonstrates how to implement asynchronous features in a Razor Pages application, including adding asynchronous processing to data repositories, making repository method calls asynchronous, and calling asynchronous PageModel action methods from Ajax requests, ultimately leading to improved performance and concurrency handling.