The fastest way to change or flip pins
i did through test on speed differences between direct port manipulation , using arduino digitalwrite() function. check out.
http://www.billporter.info/?p=308
http://www.billporter.info/?p=308
you should put in pdf , stick on playground... 

Arduino Forum > Forum 2005-2010 (read only) > Software > Syntax & Programs > The fastest way to change or flip pins
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