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Multi-board float benchmark

In an effort to figure out how fast/slow my various boards are, I wrote a floating point benchmark to help compare.

So far, compared to my UNO, My DUE is 3.3x. My STM32 Discovery board (475 iot) / mbed is 4x. And to my surprise my WEMOS D1/R2 @160 is 7.5x.

I was really surprised by the D1. I may start standardising on this one, WiFi or not.

subversion project is at

There should be enough information in the platform.ini to make whatever board you have work.

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