Should you’ve got an iOS apparatus (haven’t yet managed to make this work on my Mac):

  • Download the connected Speed Test app from the App Store
  • Launch the app
  • You should see a big Go button

Now, before you go any farther, allow me to put this out caveat: If you hate jump scares, even ones that are gentle, go no more.
You should feel the occasional tap, occurring more and more often. Then a small light show. Keep pressing.

  • Press and hold the Go button. Don’t let go

Amazing to see that the amount of work that must have gone into this exceptionally hidden feature. Nicely done.