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
So that you can get feedback on it and make it better Fascinatingly, one of the other big complaints people had about agile is no iteration. I don't understand how being in an agile environment makes people less iterative, but somehow that seems to be the case. And I think it's because people misunderstand and think that agile is just about putting features out faster, and not about the important part, which is getting something in front of users faster so that you can get feedback on it and make it better. Laura Klein & Kate Rutter, Problems With Agile UX The most rewarding iterationsTo anticipate all the uses and abuses agileiteration