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As you can see in the top banner, it's using the "interpreted" mode, which is the slowest runtime mode for running .NET on mono-wasm. But it's also the "compatible" mode.

It would be possible to produce an AOT build which would be 50x faster, but it's a little more work and it wasn't the goal of this demo.

Impressing with performance is one hell of a goal for a demo.

Here is another one then - Windows Calculator running in the browser. https://calculator.platform.uno/

Chrome says 68.4MB(10.5MB compressed)for the Todo app and 61 for the calculator app.

If you look in the *.clr files you see things like "This program cannot be run in DOS mode." which i found amusing.