README.md

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• actually-realized data rates are often smaller in practice than according to underlying specs,
  • see even i.e. transfer of some tens-of-megabytes onto an SD card (copying a gcode file) - we observe only ~ 20mb/sec of advertized 80mb/sec or so
• otherwise, you have notes on what-the-point is in your scratch
• and consider linking to the ring-test page
• and discuss that at the embedded limit, we often run into interrupt-request-handling-time troubles before anything else...