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It would be a shame if you put months of your life into creating an intuitive, natural, and even beautiful interface only to have your users tapping their fingers on their collective desks waiting for it to respond. Watching your application screech to a halt because of a long-running process is just painful. However, creating applications that are responsive takes some careful planning, which usually entails having long-running processes work in other threads so that the UI thread is free to keep up with the user.