The time scale of the user experience

From the beginning of contact with the Internet, has been concerned about the speed of each Web page browsing, regardless of the size of domestic and foreign sites, and each user's browsing time is not the same, so as to understand the user browsing the page on the importance of time experience scale. A few days ago read this article feel good, so translated a part of it with you to share.

From 0.1 seconds to 10 or more, user interface design has many different periods of time, each with its own unique usability problems.
In the user experience aspect has its own version "The powers of 10" (Charles Eames 1968 years Classic documentary). For us, things are not larger or smaller in multiples of 10, and most user interfaces have roughly the same physical dimensions, which are determined by the human body. For example, the BlackBerry keyboard is about 1/5 the size of the computer keyboard, not the size of 1/10. And, in addition to the wall size of the display, nothing would be bigger than a 10 times PC monitor.
But in the fourth dimension-time, the time scale of the user experience exceeds multiple of 10.

　
0.1 seconds.
The influence of time on people's perception and psychology, many effects occur at this temporal scale.
The team, led by Dr. Gitte Lindgaard, found that people can produce a first sensation in just 50 milliseconds after a Web page appears, that is, 1/20 seconds (50 milliseconds is only half 0.1 seconds, but it is quite close to the "10-side" analysis). In Lindgaard's study, screen images switch to testers every 0.05 seconds, and they can still distinguish between good and bad design. It is important to realize that this is not how the user actually uses the Web page, first of all, the page does not display a single moment of time on the screen, but it may show a second (longer if you're lucky), and secondly, when people decide what to do next, It often takes a while to look at the current page. Nevertheless, the study shows that people can form a basic visual impression very quickly.
0.1 seconds is a time limit if you want users to feel the effects of their actions happen immediately. For example, when you click on a pop-up menu, if the menu pops up within 0.1 seconds, the user's feeling is immediately occurring, or if it's more than 0.1 seconds away, then the feeling is not "immediate", on the contrary, the feeling is that the computer is doing something before the pop-up menu. Therefore, to establish an immediate response from the user, the interface operation must be less than 0.1 seconds. In the study of eye tracking, most of the results were less than 0.1 seconds. In fact, the focus of eye tracking research focuses on the impact of the time that people are switching pages when they look at the page. People look at things very directly, so we must pay attention to the clarity of the content.

　
1 seconds.
When the computer is longer than 0.1 seconds, but not more than 1 seconds to respond to your input, it feels like the computer is outputting results. Although the user feels a brief delay, they will still continue on to the current thing. This means that in a 1-second response time, the user has a sense of an interactive control, even if they find that this is a two-way interaction (between them and the computer). In contrast, 0.1 seconds of response time, users just feel they are doing things themselves.
For web usability, this means that new pages must be displayed in 1 seconds before users feel free to browse, and if they are slower than that, they will feel the computer is blocking their browsing. In the early days of web development, it was not possible to achieve this kind of page download time. This is why many guides recommend you to minimize the number of pages you need to browse: At that time, it would be unpleasant for users to navigate to a new page because opening a new page would take more than a second. Today, with the popularity of broadband, download time within 1 seconds is very possible, should be the pursuit of the goal. The main problem now is not large graphics or large page content (the number of kilobytes). Now, the reason for the slow response is more due to the plethora of dynamic elements and complex designs. (Also, it is important to remember that some people are still using dialing methods, especially in rural areas or developing countries.) Mobile devices also have a slower connection, so the mobile version of your site usually requires special consideration for these. ）

　
10 seconds.
After 1 seconds, the user will have to wait for the computer to respond, the longer the wait, the greater the impatience, about 10 seconds later, the user's mood will reach its limit, and the mind will begin to doubt that, over 10 seconds, users will often leave the site instead of trying to resume what they want to do in the first place. 10 seconds is also such a time, at this point in time, the user will think that the page is not good, and decided to leave. If the average page access time is 30 seconds, for experienced users, they will assign a shorter time to each page. When people browse the Internet, they either meet their needs or they may leave.

　
1 minutes.
Users should be able to complete simple tasks within 1 minutes. Poorer sites may take more than a minute to complete simple tasks, such as transferring money from a savings account to a checking account-and will be canceled by the user. Most of the video ads on the home page should not be more than 1-2 minutes, because people don't like to passively look at things longer than this.

　
10 minutes.
10 minutes will be a long time to visit the site. In one case, for example, we looked at the purchase behavior of a user on a business-to-business Web site, which visited 25 pages and the longest Web Access time was 7 minutes.

　
1 hours
Most usability studies last 1-2 hours, because it's hard to get users to test longer, unless we're testing children--for them one hours is already the biggest--we usually limit our test time within 90 minutes. People will feel tired after testing for two hours. Most of the online tasks will be completed within one hours. In one study, half of the e-commerce buying behavior took place within 28 minutes of the user's entry into the site. The other half, of course, is distributed over a longer period of time.

　
1 days
One day is the maximum response time for a customer transaction request, although you should send e-mail and transaction confirmations within 1 minutes to let users know that their behavior system has responded appropriately, such as changes to user orders or user addresses. The difference here is that if the user does not get a response within 1 minutes, they will assume that the service requires manual intervention, not that the computer is broken, and, of course, that the faster response is better. Many users regularly check for updates to certain content every day, so you can send a daily email message to your users if you want to (but note that you should also post a unsubscribe feature).

　
Original: http://www.useit.com/alertbox/timeframes.html