Improve the load time performance of Blazor WebAssembly apps on low-end mobile devices (original) (raw)

We've been hearing reports from users that load performance of Blazor WebAssembly apps on low-end mobile devices can be very slow. For example, this user on Twitter reported "bootstrapping is very slow on low-end mobile devices (~10s), caching doesn't help this". We should investigate where the time is being spent on these devices and evaluate options for improvement.

• If the issue is WASM compilation time, that's on the browser to improve.
• If the issue is .NET runtime startup time, preinitialization might help.
• Perhaps we could also cache the preinitialized results with a snapshot of the memory.
• Or maybe these apps are doing something dynamic on startup that's slow.

The first step is to collect some performance profiles. Any help is appreciated! 🙏