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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168
votes
11answers
39k 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 ...
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 ...
82
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 ...
39
votes
6answers
3k views

Will forcing response time to the average time as a minimum improve UX?

I have a situation where my Ajax call response time could vary from 14ms to 600ms, because of the complexity of a Query they could make. From my experience Users take for granted those 20-80 ms round ...
39
votes
7answers
2k views

Would intentionally slowing down UI help to increase sales on shopping sites?

I've noticed that iTunes store is always slow, at first I thought it's just because iTunes is a bloatware (which it is, on both Mac and Windows.) However I started to wonder whether this is ...
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 ...
29
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 ...
28
votes
4answers
11k views

What are the best practices for background images?

We are placing a large, non-repeated background image. It's very heavy; takes up almost 60% of the page load time. If you visit MSN or other high profile sites, they are using repeated background ...
26
votes
10answers
1k 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 ...
25
votes
2answers
777 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 ...
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 ...
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?
20
votes
5answers
632 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 ...
16
votes
4answers
1k views

What is the expected timeframe of a double click?

In the web application, the user draws a polygonal area on a map each click setting a vertex. A double click allows the user to finish the area. Due to technical circumstances, I have to detect double ...
14
votes
6answers
555 views

What is more pleasing to the eye fade in or suddently appear

I have a pop up menu. What is said to be easier on the users' eyes? Should I just have it appear immediately using visibility = true or should I have it fade in using opacity animation?
14
votes
3answers
983 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 ...
13
votes
5answers
418 views

Automatic UI without explicit “perform action” controls

Having seen a number of examples over the years I've been wondering where this kind of interfaces stand today. What I mean by "automatic UI" is the following. Normally on screens, dialogues and web ...
13
votes
3answers
343 views

A single, long load - or multiple short loads, which would provide a better experience?

I have a very large, modular web application. When it starts I can do things one of three ways: A moderately long load time (about 60 seconds) to fetch all of the modules from the server (presented ...
13
votes
3answers
2k views

How to measure UI lag on computer?

Are there any tools available to help measure the UI lag of a given application running on a given computer? There are plenty of guidelines out there as to how "fast" a UI ought to be, but how can I ...
13
votes
2answers
521 views

Is showing a loader inside a button on mobile a good practice?

On many apps the "loading" state is displayed inside a blank screen. I was considering having it directly inside the touched button but I wanted to know if it's something common. I don't have example ...
12
votes
6answers
1k views

If you can't improve loading time, is distracting the user a good technique?

On several implementations I've worked with, loading times can be as high as four seconds for the start page. When all reasonable options are done, is it possible to distract the user to make the ...
11
votes
8answers
1k views

Fast-loading splash screen or flashy, progress-based splash screen? [closed]

Related Question Pros/cons of splash-screen with articifial loading delay This is a fairly subjective question, but in my opinion most discussion on UX is at least a little subjective. So ...
9
votes
5answers
982 views

UI Lag: What's considered “smooth”?

I'm building a drawing application that let's users annotate images and diagrams in a freehand style. Not unlike a glorified MS Paint program, but there is heavy background processing going on. ...
9
votes
4answers
331 views

What modern human-technology interactions have been ingrained into your mind, so that you expect them?

During the course of my day, I have noticed human-technology interactions that have become so normal to me, that I have committed them to muscle-memory. Here are two examples: When attempting to ...
9
votes
4answers
425 views

Amount of Time To Determine a User Has Stopped Typing

I have a filter form for a list. One of the fields is a text search field. When a user types in the field, I wait until the user has stopped typing for a half second (500 milliseconds), and then ...
9
votes
1answer
420 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
8answers
1k 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 ...
8
votes
4answers
306 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 ...
8
votes
2answers
189 views

How to load long-time-taking content?

We have a page that takes very long to load (approx. 15 seconds, might be even more for some clients) as the data it generates is heavy and slow. While we are trying to directly speed it up, 15 is ...
8
votes
3answers
553 views

Load Fonts First or Last?

Fonts compete for available bandwidth and out of necessity have to be referenced as external files, rather than being inlined as can be done with essential CSS to avoid a FOUC (Flash of Unstyled ...
8
votes
3answers
707 views

Does a “faster” loading indicator make website/software seem faster?

While checking how a site works on Internet Explorer, I noticed that the page loading indicator spins a lot faster than in other browsers. Also, the iPhone uses a noticeably slower activity indicator ...
7
votes
3answers
195 views

How slow can an app be to keep feeling responsive?

I'm creating an editor to write requirements and I want to give suggestions to the user about what to write. How fast do I've to present the suggestion so that it feels responsive to the user. ...
7
votes
5answers
52 views

Recording website speed

Are there any excellent sites out there that evaluate a website's loading speed at different levels of Internet connection? I have used this site in the past but the information is out of date and I ...
7
votes
4answers
2k views

How long should the delay be before a tooltip pops up?

I'm working on web site in which a "ribbon" submenu pops up as soon as the mouse touches one of the main menu items. I'm trying to explain to the designer that it should wait until the cursor has ...
7
votes
2answers
241 views

Dynamic search results - a la google?

We've a few apps where I work that make use of content search. EG, you can search for specific text within a document held in our system. One thing we've been looking at is having the search start as ...
7
votes
2answers
1k views

Why do websites use “you are being redirected…” pages?

Frequently after logging in a website - specially old ones - I see the following: Welcome! You are being redirected, please click here if your browser does not redirect you. And similar pages ...
6
votes
7answers
1k views

What are alternatives to a large drop down select list?

I am adding a single selection drop-down containing a list of all countries (around 200+ items). In Windows it works fine as it displays 10-15 countries at a time and the scroll bar shows up. On the ...
6
votes
2answers
1k 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 ...
6
votes
3answers
208 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) ...
5
votes
4answers
135 views

How should cancelled animations behave?

How should an animation behave when it is cancelled/changed? For example, let's say I have a button in my application that triggers the visibility of a tool panel. When the panel is shown, an ...
5
votes
2answers
305 views

How to display UI operation delay

I am implementing some UI functionality. I have a button that perform some short or long (time) action. I have implemented so logic: if action's execution time more then some in milliseconds, then ...
5
votes
2answers
174 views

When to commit user data (a humble request from a systems guy…)

So, I am a systems programmer working on a UI (bad idea, maybe, but I think I do ok all things considered). Anyway, my program is an interface to a service running on a remote machine which controls ...
5
votes
3answers
306 views

Managing an App's Loading Time Expectations

I was recently asked to come up with a framework to benchmark loading time expectations based on the tasks being performed in the app. I found that there were three categories in which I could define ...
5
votes
3answers
745 views

How fast does autocomplete need to be for a good user experience? [duplicate]

Has there been any study into how quickly autocomplete suggestions need to show up for a good user experience?
4
votes
3answers
379 views

Assume success and show response immediately or wait for a response from the server?

All over my CMS I have buttons that toggle something on or off by sending an ajax request, updating the db, and then changes state and value of the button on success. Very basic "ajax" and "toggle". ...
4
votes
2answers
151 views

Should options in a droplist be sorted by popularity or alphabetically?

I'm building a flexible search tool where the user can put together a query against one or many of a long list of fields to pull back a list of results. I was considering a TFS like query builder ...
4
votes
2answers
1k views

Benefits and drawbacks of modal windows

I'm working on a web application and am a little stuck trying to figure out how I should implement signup forms, login forms, contact forms, and payment forms. I can implement all these in either: ...
4
votes
2answers
223 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 ...
4
votes
1answer
151 views

UX in Optimisation and Simulation

As defined by IBM: "[Optimization and Simulation products provide users with help creating] the best possible plans, explore alternatives [and] understand the trade-offs". Based on the ...
4
votes
1answer
242 views

UI Guidelines when delivering application over Citrix

I'm after some advice regarding some guidelines to consider when deploying applications over Citrix. My company is going to be using Citrix in the near future. We have suppliers who deliver our ...