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Design for loading
Swwweet
June 20, 2014
Design
4
320
Design for loading
Presentation by @htmlboy and at WebVisions Barcelona, on June 2014.
Swwweet
June 20, 2014
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Transcript
DESIGN FOR LOADING Javier Usobiaga @htmlboy
None
@HTMLBOY Swwweet.com
How much time does a website need to be
loaded?
How much does it weigh?
THE PROBLEM
“We've remade the Internet in our image… Obese.” –
Jason Grigsby –
The average webpage was 1.46MB in June 2013.
Mostly images. Source: httparchive.org
The average webpage in June 2014 is 1.78MB.
Mostly images. Source: httparchive.org
None
milwaukeepolicenews.com 7MB
grolsch.com 25MB
moto.oakley.com 85MB
Just because we can, it doesn’t mean we should.
None
None
74% of mobile users won’t wait longer than 5 seconds
for a page to load. Source: bit.ly/5secondsmobile
20€/month for 1GB
85MB = 1.70€ 20€/month for 1GB
US roaming: 10€/MB
85MB = 850€ US roaming: 10€/MB
None
None
Consider performance as a design principle.
Set a performance budget.
“Don't make more than 20 http requests.”
“Make the page weigh less than 300KB.”
“1. Optimize an existing feature or asset. 2. Remove an
existing feature or asset. 3. Don’t add the new feature or asset.” – Steve Souders –
How much time does a website need to be
loaded?
None
How much time does a van need to hit
the water when falling from a bridge?
None
INCEPTION TIME
INCEPTION TIME when milliseconds become hours (or never)
How much time does a website need to be
loaded?
How much time does a website need to look
loaded?
Perceived performance
DESIGN FOR LOADING: JS & NAVIGATION
Performance 101: JS belongs at the end of the HTML
“We don't have any non-JavaScript users… No, all your
users are non-JS while they're downloading your JS.” – Jake Archibald –
No JS = No navigation
JS folding = visual glitch
None
None
<div class=container> <header> <!- -Logo and headings- -> </header> <nav>
<!- -Navigation links- -> </nav> <section class=content> <!- -Err… content- -> </section> </div>
.container{display: table;} ! nav{display: table-footer-group;}
None
None
css-tricks.com/snippets/css/a-guide-to-flexbox
DESIGN FOR LOADING: WEB FONTS
FOUT Flash Of Unstyled Text
None
None
None
Consider not using web fonts for body copy.
Choose a fallback with a similar x height.
None
None
Use JS to control the inbetween stages.
github.com/typekit/webfontloader
.wf-loading .wf-active .wf-inactive .wf-<familyname>-<fvd>-loading .wf-<familyname>-<fvd>-active .wf-<familyname>-<fvd>-inactive
Add a timeout to trigger rendering of at least one
font.
WebFontConfig = { google: { families: ['Droid Sans'] }, timeout:
2000 };
Consider a lazy load on the first visit, and
display only cached webfonts.
DESIGN FOR LOADING: IMAGES
The average webpage in June 2014 is 1.78MB.
Mostly images.
Optimize images: ImageOptim JpegMini SVGO
addyosmani.com/blog/image-optimization-tools
Regular JPEG
Progressive JPEG
But… what happens before the image is downloaded?
FOLOI Flash Of Lack Of Images (duh)
No image = visual glitch
span.main-image{ display: block; min-height: 500px; background: #EEE; }
Min-height = no glitch
DESIGN FOR LOADING: GOING FURTHER
Conditionally load, or avoid: secondary assets third-party content iframes social
plugins
Consider plain links instead of social plugins/iframes.
https://twitter.com/intent/tweet? url=http://bit.ly/ ancientMistery&text=What+is+your+sound? &via=htmlboy Twitter:
http://www.facebook.com/sharer.php? u=http://bit.ly/ancientMistery&t=What+is +your+sound? Facebook: https://plus.google.com/share? url=http://bit.ly/ancientMistery Google+:
Maybe inline critical CSS/JS?
None
None
WRAPPING UP
loading
Browsers won’t wait for every file to be loaded.
Accept that, and design also for loading.
THANKS! @htmlboy · javier@swwweet.com