USB to digital I/O delay ?

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Wolfram, my benchmark was for Raw-HID communication - NOT serial.
Advantage of Raw-HID is, that it does not need any driver installation :)

PS: firmware is already stripped down. Now, benchmark app is left to be stripped down.
 
Now here is the benchmark code.
The benchmark result has not changed.

rawhid_latency folder is for Arduino, check source
rawhid_latency_host is project file for Visual C++ Express 2013 SP4, check README for further dependencies
 

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