Website Response Times An Article by Jakob Nielsen www.nngroup.com Users really care about speed in interaction design...A snappy user experience beats a glamorous one, for the simple reason that people engage more with a site when they can move freely and focus on the content instead of on their endless wait. 0.1 seconds gives the feeling of instantaneous response. This level of responsiveness is essential to support the feeling of direct manipulation. 1 second keeps the user's flow of thought seamless. 10 seconds keeps the user's attention. A 10-second delay will often make users leave a site immediately. uxperformanceinteraction
Unfolding In short, the architect is responsible for building construction, is watching the building unfold continuously, and is making ongoing modifications as it becomes clear from each given stage, what modifications and changes should be made at each moment. And this is all to be done within a management framework that controls budget and cost very tightly. Christopher Alexander, The Battle for the Life and Beauty of the Earth In terms which must be altered