That's extremely fast on Firefox and Chrome while it comes to a crawl on Microsoft Edge (Chromium) for some reason.
EDIT: Found it. "Enhance your security on the web" option in Edge makes it significantly slower. Disabling the option fixes the performance issues.
That setting disables JIT - on some or all sites depending on the value.
https://support.microsoft.com/en-us/microsoft-edge/enhance-y...
https://bandysc.github.io/AvaloniaVisualBasic6/