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This page starts running the main exe when it loads, which will
block the UI until it finishes! Adding UI controls to manually configure and start it
are TODO.
Achtung: running it with the dev tools open may
drastically slow it down. For faster results, keep the dev
tools closed when running it!
Output is delayed/buffered because we cannot update the UI while the
speedtest is running. Output will appear below when ready...