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ASP.NET Core Blazor performance best practices

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Note

This isn't the latest version of this article. For the current release, see the .NET 9 version of this article.

Warning

This version of ASP.NET Core is no longer supported. For more information, see the .NET and .NET Core Support Policy. For the current release, see the .NET 9 version of this article.

Important

This information relates to a pre-release product that may be substantially modified before it's commercially released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

For the current release, see the .NET 9 version of this article.

Blazor is optimized for high performance in most realistic application UI scenarios. However, the best performance depends on developers adopting the correct patterns and features.

Note

The code examples in this node of articles adopt nullable reference types (NRTs) and .NET compiler null-state static analysis, which are supported in ASP.NET Core in .NET 6 or later.

Ahead-of-time (AOT) compilation

Ahead-of-time (AOT) compilation compiles a Blazor app's .NET code directly into native WebAssembly for direct execution by the browser. AOT-compiled apps result in larger apps that take longer to download, but AOT-compiled apps usually provide better runtime performance, especially for apps that execute CPU-intensive tasks. For more information, see ASP.NET Core Blazor WebAssembly build tools and ahead-of-time (AOT) compilation.