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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.
Output is sent to the dev console because we cannot update the UI while the
speedtest is running unless/until we move the speedtest to a worker thread.
Achtung: running it with the dev tools open drastically
slows it down: by a factor of 2.5+. For faster results, keep the dev tools closed
when running it!