I can't imagine any part of this Thread being relevant to a newbie.
"How fast is an Arduino?" is a pretty valid newbie FAQ.
It's difficult to answer in a meaningful way, since most of the people who have to ask that question have an equally poor understanding of how fast a computer needs to be to accomplish particular tasks. "Can by Arduino do two human-interface tasks at once?" is about as common as "What's the best camera for image analysis on my Arduino?"