Let’s face it, users are impatient. They demand a blazingly fast experience and accept no substitutes. While the effects of poor performance are obvious, it makes one wonder about the relationship between client latency and the “perception of speed”. After all, the user can trigger many state change events (page load, submit a form, interact with a visualization, etc.) and all these events have an associated latency to the client. However, are certain types of latency more noticeable to the user then others?