Users are more satisfied and will wait longer when a site uses wait animations such as percent-done bars and spinners to explain >1 s response times delays.| Nielsen Norman Group
How users react to delays in a user interface, whether website or application. The 3 main response time limits are determined by human perceptual abilities.| Nielsen Norman Group
Slow page rendering today is typically caused by server delays or overly fancy page widgets, not by big images. Users still hate slow sites and don't hesitate telling us.| Nielsen Norman Group
What users believe they know about a user interface impacts how they use it. Mismatched mental models are common, especially with designs that try something new.| Nielsen Norman Group
Animation in UX must be unobtrusive, brief, and subtle. Use it for feedback, state-change and navigation metaphors, and to enhance signifiers.| Nielsen Norman Group
The total cognitive load, or amount of mental processing power needed to use your site, affects how easily users find content and complete tasks.| Nielsen Norman Group