In this post, we speed up initial load time by prerendering our Blazor WebAssembly application.

Now, we need to discuss how to mitigate the biggest drawback of using Blazor Web Assembly: the initial load time. While the Web Assembly solution allows us to enjoy a serverless deployment scenario and fast interactions, the initial download can take awhile. Users need to sit around while the browser downloads the .NET runtime and all your project’s DLLs.

While the ASP.NET Core team has made a lot of progress in improving the .NET IL linker and making framework libraries more linkable, the initial startup time of Blazor Web Assembly apps is still quite noticeable. In my case, an initial, uncached download takes 7 seconds. With prerendering, I was able to cut this down considerably. That is the focus of this post.

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