the time it takes a UI to respond to an action by the user and the effect this has on UX.

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34
votes
16answers
2k views

How long should a page take to load?

Back in 1997 Jacob Nielsen was suggesting: Currently, the minimum goal for response times should therefore be to get pages to users in no more than ten seconds Obviously expectations have sped ...
91
votes
15answers
25k views

Is coffee a good excuse for a slow application start-up time?

I was dragged into a meeting with a client to consult on any usability issues as we watched a user performing day-to-day operations with a software application. The first thing that happened was that ...
21
votes
4answers
2k views

What is an acceptable response time for my ajax ui?

When I have to load new information from my web server via ajax after a user action, how fast should the information be displayed for the user in order to be a good working UI for the user?
168
votes
11answers
38k views

Why do users click randomly and rapidly when an application hangs?

This question came to me when I witnessed a collegue's behaviour on an application freezing due to a large operation. And it's something I've certainly done myself. An app freezes for more than a ...
80
votes
16answers
8k views

Is Google Instant good or bad UX?

For power users, it clearly saves time in some circumstances. It also jumps around alot and does things that are very different than before. One person said it is like a guy who finishes your ...
25
votes
2answers
704 views

Defining “Instantaneous” as part of usability acceptance criteria

The Setup I have run into this problem time and time again. An interface is performing slow and QA and/or Engineering come back and ask, "can you please define the acceptance criteria for how fast ...
8
votes
8answers
878 views

What to display while waiting for a process (4-5 seconds) to complete?

We realized that in some cases the user may be waiting up to 4 or 5 seconds (depending on connection) for their form (or some action) to be processed. The form involves getting data from other servers ...
9
votes
1answer
369 views

Studies showing the impact of response time variability on user experience

Have there been any studies, or results, focusing on the impact of variability in latency of response times on the overall user experience? I'm aware of the research on the "generally accepted" ...
8
votes
4answers
298 views

How can I maintain usability on a slow system?

Obviously a huge part of a positive UX is a fast, responsive design. The software I work with (Electronic Medical Records) is sometimes used on sub-standard devices (e.g. ancient desktop PCs) or in ...
28
votes
7answers
1k views

How patient are users at wait dialogs?

What is the length of time the average user will wait at a wait indicator (i.e. a spinning circle, beach-ball-of-death, egg-timer) before they think something has gone wrong? If anybody can point to ...
25
votes
10answers
973 views

Should aspects such as page render time or time taken to retrieve results be considered part of UX?

I was just reading this very interesting article on Fast Company about how How One Second delay Could Cost Amazon $1.6 Billion In Sales annually. To quote the article Amazon's calculated that a ...
22
votes
8answers
1k views

How can I distract / entertain people in an app while waiting?

We should do whatever we can to make our apps and websites as fast as possible, but there are some times when there is nothing that we can do to speed up some process, and so our customers just have ...
6
votes
2answers
846 views

Activity response, startup times

I'm interested in what is a reasonable start up time or behavior for applications on smart phones. This is simply when you click an icon on the launcher (as it may be called on Android) to the moment ...
1
vote
1answer
400 views

Loading Times / Breaking points

We all know that a user is not going to wait forever for a website to load. Given there are certain factors and circumstances that can apply to this, is there a breakdown of users stages/breaking ...
4
votes
2answers
222 views

Empirical measures of performance

Other than time on task, error rates, memorability and use of help; what other empirical measures of performance can one measure an interface by? Please expand your answers with real-world ...
20
votes
5answers
624 views

Will faster GUI always make one more efficient?

Are there any studies on whether one will actually get more done during a days work if delays went down i. e. from 10 ms to 5 ms for each update. My point is that if we are already working at the ...
14
votes
3answers
881 views

Is it bad design to hide a form's success message after a short time?

I was working on a non profit site www.gettingtoknowcancer.org and one of the requirements was to have a subscribe form on the right.So I created the subscribe form like this which when clicked ...
6
votes
3answers
193 views

Showing the status of an action on a button

I have an application that can synchronize content between a website and a social network. with a button you can turn on and off the synchronization. the user needs to see the status (sync on or off) ...