50 milliseconds: how fast visitors judge your website

Short answer: visitors form an opinion of a website’s look within 50 milliseconds, a twentieth of a second. That is what Gitte Lindgaard and colleagues at Carleton University found in 2006. People who saw a homepage for 50 milliseconds rated its visual appeal almost exactly like people who saw it for ten times as long.

What the study tested

The researchers ran three experiments. In the first, participants saw homepages for 500 milliseconds each and rated their visual appeal, twice in a row. In the second, they also rated seven specific design qualities. In the third, the team added a 50 millisecond condition with the same homepages.

The ratings were stable: whoever liked a page in the first round also liked it in the second. And the ratings after 50 milliseconds closely matched those after 500 milliseconds. The paper appeared in the journal Behaviour & Information Technology and has been cited over 1,000 times.

What 50 milliseconds mean for your homepage

In 50 milliseconds nobody reads a headline. What counts is what the eye takes in at once: layout, colours, images, how much empty space there is. That first impression comes before your offer, your prices and your references. From our work on client sites, three things matter most:

1. One clear focus on the first screen. A large image or a strong headline, not five boxes of equal weight.
2. Real photos. Your team, your work, your premises. Generic stock photos look interchangeable.
3. A calm layout. Few fonts, few colours, enough space. A cluttered first screen looks unprofessional before anyone reads it.

Speed is part of this too. A page that is still loading after 50 milliseconds gives no first impression at all, or a bad one. Why a slow site costs customers is covered in How a slow website costs you customers.

What the study does not say

The study measures how attractive a page looks, not whether visitors buy or get in touch. A good first impression opens the door. Whether someone stays depends on content, prices and trust. The study is also from 2006, when most people browsed on desktop. Later research has confirmed the speed of the first judgement, but the exact milliseconds depend on the setup.

Written byChristoph SpeiserProject lead & sales

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