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ASP.NET MVC–Precompile Razor views on Release build

Last week I was investigating slow startup times of an ASP.NET MVC web application. We were able to trace the root cause to a really complex Razor page. This was the first page that was loaded and takes a long time to compile.

By default Razor compilation happens the first time a Razor page is requested by the browser. However you can change this and prebuild all the Razor pages by adding the MvcBuildViews tag to your .csproj file:

<?xml version="1.0" encoding="utf-8"?>
<Project>
    <PropertyGroup>
        <MvcBuildViews>true</MvcBuildViews>

Unfortunately it had a large impact on the build times making debugging a pain for the developers. So in the end we decided to only precompile Razor on a release build. Therefore we had to add 2 MvcBuildViews tags with a condition:

<MvcBuildViews Condition="'$(Configuration)'=='Debug'">false</MvcBuildViews>
<MvcBuildViews Condition="'$(Configuration)'=='Release'">true</MvcBuildViews>
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