ASP.NET Core 9.0 is a cross-platform, high-performance, open-source framework for building modern, cloud-based, Internet-connected applications. One of its biggest benefits of ASP.NET Core is – performance. When you compile your code, it automatically optimize it in order to increase the performance. The best part about this particular benefit is that you do not have to change your code. With the re-compilation it optimizes the code directly.