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Improve the startup time of your .NET Core application

Starting from .NET Core 3.x tiered compilation is enabled by default. This allows you to use precompiled code from assemblies created using the ReadyRoRun(R2R format. R2R is a form of ahead-of-time (AOT) compilation.

It improves startup performance by reducing the amount of work the just-in-time (JIT) compiler needs to do as your application loads.

To use this feature you need to enable ReadyToRun and publish your application as a self-contained app.

  1. Add the <PublishReadyToRun> setting to your project:

    <PropertyGroup>  
       <PublishReadyToRun>true</PublishReadyToRun>
    </PropertyGroup>

  2. Publish a self-contained app. Here is an example targetting the Linux ARM64 runtime:

    dotnet publish -c Release –r linux-arm64 --self-contained

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