There is a direct relation between a pages loading times and the conversion rate of its users. Just a small reduction in loading times can lead to a significant increase in conversions.
Users expect a page to load in 3 seconds or less. Slow websites cause frustration with users which leads to a higher bounce rate.
Long loading times, especially on mobile devices, cause a large amount of cognitive load similar to the stress experienced when watching a movie or solving a difficult math problem.tsteht.