As I said above there is no reason for me not to choose a Due.
In this thread I did compare pure integer compute power of the Due with that of a modern PC Intel processor:
http://forum.arduino.cc/index.php?topic=391511.0
Due was factor 92(83) slower, but I was surprised that it was only a factor 92(83) [depending on compiler setting -Os, optimize for size, the default in Arduino IDE, or -O3, optimize for speed].
It would be interesting to just get the runtime reported for the other three (>16MHz) Arduinos in above table, the 101, MKR1000 and Zero.
If you do have access to one of those three Arduinos, could you please flash the sketch from the the thread mentioned and report the reported runtime here?
The Due number is: 548us (-Os) 494us (-O3)
Hermann.