Have you seen UIEs research on users perceptions of download speed? Does not that really debunk the notion that code/graphic optimization improves usability? Is not it really all about scent of information and users "feeling" like they are consistently making progress?
Answer / chaitanya
Yes, I have read that. That is poorly supported elsewhere, I spend the first chapter showing why response times are important, summarizing key research into HCI and response times. However, there are factors that can affect how we perceive delays, like feedback and task complexity. Attainability is another interesting area of research, with users adjusting "subjective time bases" based on the pace of particular systems. If Domino's usually delivers in under 30 minutes, and then one day took an hour, you'd certainly notice it.
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