From Interfaces for Staying in the Flow: In summary, interfaces that are targeted at improving user’s ability to stay in the flow shouldn’t underestimate the importance of speed in supporting creativity, quality, and enjoyment. Every time there is an interruption, literal or conceptual that gets in the way of users concentrating on their tasks, flow is lost. Slow interfaces, which I define as any that get in the way of users acting on their work as quickly as they can think about it, are problematic.