DoubleClick and others websites have shown that 3 seconds is all you have. If the perceived page hasn't loaded within 3 seconds, 53% of mobile visitors abandon the page (https://www.doubleclickbygoogle.com/articles/mobile-speed-matters/). Additionally, DoubleClick reported that sites loading within 5 seconds enjoyed 70% longer sessions, 35% lower bounce rates, and 25% higher advertisement viewability.
Those examples are just a small sampling of the numerous case studies and reports available, demonstrating how important page load and interaction are for a website's success. You can find many more statistics at https://wpostats.com. This is one of the reasons web performance is continually emphasized by Google as a key ranking signal.
Human psychology is an important aspect of performance. We know how the brain perceives performance and can correlate...