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There was a research done on that a couple of years ago. Have a look here: https://think.storage.googleapis.com/docs/mobile-page-speed-new-industry-benchmarks.pdf One of the first things they mention is: The average time it takes to fully load a mobile landing page is 22 seconds, according to a new analysis. Yet 53% of mobile site visitors leave a ...


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You should consider a few strategies for helping users to focus their energy (attention and possibly frustration): Expectations Management Use a predictive system for the length of time until an agent might help them. This can be something you build, or a SaaS service you 'rent', or an extension of your existing software. You can outsource the work for ...


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The NNG website summarizes response times and need for feedback: Response Times: The 3 Important Limits In summary, 0.1 seconds for the UI to feel instantaneous. From 0.1 to 1.0 seconds the UI will have a noticable delay. After 1.0 seconds the user will feel their work is being interrupted. This is independent of the technology used for the user ...


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Adding onto @Nacho 's answer, I've quoted a reason why very short delays or instantaneous appearance should be avoided for tooltips: Tooltips, expanding ads, and calls to action or information boxes that appear over list items (such as quick-view boxes on thumbnails from product-listing pages) are other examples of common elements with hover ...


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