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
When users never use the features they asked for An Article by Austin Z. Henley web.eecs.utk.edu We deployed our tool. Almost no one used it. The handful that did use it, used it once or twice and barely interacted with it. After a few days, zero people were using it. Why did they tell me they wanted these features? featuresuxresearch