I've not had an issue with performance of the I/O but here's a technique for squeezing a little more speed out of the ports without having significant code changes.
http://www.codeproject.com/Articles/732646/Fast-digital-I-O-for-Arduino
I've not had an issue with performance of the I/O but here's a technique for squeezing a little more speed out of the ports without having significant code changes.
http://www.codeproject.com/Articles/732646/Fast-digital-I-O-for-Arduino
This looks nice until you see things like recent changing from Raspberry Pi to a Pi 2 and the library breaks! Too many folks here would not know what to do, except for some of the hard core type. 
I have not checked, but would guess the Arduino has ports mapped differently depending on the chips also.
Pass,
Clem
