It also depends what you use as your standard for comparison. If the standard is another Nokia phone then you probably right that people feel no problems. But if you compare with iPhone or Lumia, the difference in smoothness and lagginess are as clear as.day and night. N9 is a nice try, and despite the fact that i like it and have several in my possession, it lacks the basics of modern UIs, smoothness, lack of stuttering and seamless transitions.