Here are some initial test results of TI's CC3000 wifi chip on the Adafruit breakout board:
The Adafruit CC3000 library (github) was recently updated to include support of DUE. Results for some UDP and TCP tests on DUE (12 mhz SPI) and on Teensy 3.0 and 3.1 (8 mhz SPI) and mega2560 (8 mhz SPI) can be found at
(To support big buffers, required patch to SPI.transfer loop in ccspi.cpp to use uint16_t loc )
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