True Lies Of Optimistic User Interfaces
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Three user interfaces (UIs) go to a pub. The first one orders a drink, then several more. A couple of hours later, it asks for the bill and leaves the pub drunk. The second UI orders a drink, pays for it up front, orders another drink, pays for it and so on, and in a couple of hours leaves the pub drunk.
The third UI exits the pub already drunk immediately after going in — it knows how the pubs work and is efficient enough not to lose time. Have you heard of this third one? It is called an “optimistic UI.”
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Why Performance Matters, Part 2: Perception Management
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Time can be analyzed from two different points: objective and psychological. When we talk about time that can be measured with a stopwatch, we’re talking about objective time, or clock time. Objective time, though, is usually different from how users perceive time while waiting for or interacting with a website or app.
When we talk about the user’s perception of time, we mean psychological time, or brain time. This time is of interest to psychologists, neuroscientists and odd individuals like me. Objective time is dealt with by technical means, and those means have limits — whether financial, technical or otherwise — that become insurmountable at some point.
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