People make snap decisions. Forming a first impression of anyone takes just one-tenth of a second. The same applies to websites.
Users establish an opinion about your website in approximately 0.05 seconds, which affects whether they’ll stay or leave.
This number is based on particular studies. Participants in the first study were asked to score the visual attractiveness of web homepages twice, each time for 500 milliseconds. They shortened the exposure length in subsequent research to 50 ms.
Ratings of visual appeal and correlations between the 50 ms and 500 ms conditions were consistently very high from one phase to the next. Thus, the ability to judge visual appeal within 50 milliseconds means you have roughly 50 milliseconds to create a positive first impression with your website.
This first impression is influenced by various elements, including the layout, colors, spacing, symmetry, text volume, fonts, and others. this article.