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November 8, 2013
Performance &
Responsive Web Design
(RWD)
NebraskaJS via @zachleat
Thursday, November 8, 12
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About Me
✤ @zachleat on
✤ zachleat.com
[email protected]
✤ Zach Leatherman
✤
Thursday, November 8, 12
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My Projects
✤ BigText ✤ parseIntimate.com
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My Projects
✤ ALARMd.com ✤ f2em.com
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Housekeeping
✤ We need one or more volunteers to speak at January’s NebraskaJS.
✤ Tweet @nebraskajs with Topic Ideas even if you don’t want to speak.
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Goals
✤ Primer
✤ RWD !== Media Queries
✤ 99 Problems
✤ Buzzkills
✤ RWD Showcase Showdown
✤ Be kind, RWD.
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Primer
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RWD is
✤ A Flexible Grid (Fluid: % + Min Widths)
✤ Flexible Media (Images, Video)
✤ (Not Just)
Media Queries
http://unstoppablerobotninja.com/entry/on-being-responsive
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http://www.w3.org/History/19921103-hypertext/hypertext/WWW/TheProject.html
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http://www.w3.org/History/19921103-hypertext/hypertext/WWW/TheProject.html
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http://www.w3.org/History/19921103-hypertext/hypertext/WWW/TheProject.html
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RWD & performance
✤ Two alternatives to RWD:
✤ Do nothing
✤ Use a separate m.dot site
✤ Redirects are slow.
✤ Maintenance of UA-Parsing Server
Side Redirects (WURFL updates ~monthly)
✤ Content Strategy (Desktop Mode link)
http://en.m.wikipedia.org/?useformat=mobile#_
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Google recommends RWD
✤ “It keeps your desktop and mobile content on a single URL, which
is easier for your users to interact with, share, and link to and for
Google’s algorithms to assign the indexing properties to your
content.”
✤ “Google can discover your content more efficiently as we wouldn't
need to crawl a page with the different Googlebot user agents to
retrieve and index all the content.”
http://googlewebmastercentral.blogspot.com/2012/06/recommendations-for-building-smartphone.html
Thursday, November 8, 12
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Content Strategy
“Mobile users want to see our menu,
hours, and delivery number. Desktop
users definitely want this 1mb png of
someone smiling at a salad.”
https://twitter.com/wilto/status/63284673723375616
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99 Problems
✤ Browsers Download and Block Rendering on Unnecessary CSS
✤ Browsers Sometimes Download Unnecessary Images
✤ Big Images are Wasted on Small Screens
✤ Related: Retina Images are Wasted on Blurry
Screens
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The “Average” Web Page
http://httparchive.org/interesting.php#bytesperpage
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JavaScript Can Block
✤ “With scripts, progressive rendering is blocked for all content
below the script.”
http://developer.yahoo.com/blogs/ydn/posts/2007/07/high_performanc_5/
Thursday, November 8, 12
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JavaScript that Doesn’t Block
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JavaScript that Doesn’t Block
http://calendar.perfplanet.com/2010/the-truth-about-non-blocking-javascript/
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JavaScript that Doesn’t Block
var
script
=
document.createElement("script");
script.type
=
"text/javascript";
script.src
=
"foo.js";
document.getElementsByTagName("head")
[0].appendChild(script);
http://calendar.perfplanet.com/2010/the-truth-about-non-blocking-javascript/
Thursday, November 8, 12
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Stylesheets Block
✤ “Browsers (except Opera) block rendering until all screen CSS
arrives. With the worst possible experience: white page.”
✤ “Browsers download CSS they don't need, e.g. print, tv, device-
ratio... And most browsers (except Opera and Webkit) block
rendering because of these too”
✤ http://www.phpied.com/files/css-loading/mq.php?mq=all
http://www.phpied.com/css-and-the-critical-path/
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WebKit
http://www.igvita.com/2012/06/14/debunking-responsive-css-performance-myths/
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Everything Else*
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Downloading CSS
http://scottjehl.github.com/CSS-Download-Tests/
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Downloading CSS
Firefox 16
Safari 6 Chrome 22
Opera 12
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Solutions
✤ CSS is sacred. Choose minimal when possible.
✤ Separate elements for each Media Query
✤ Doesn’t scale if you have a lot of breakpoints.
✤ Good for WebKit, what about everything else?
✤ eCSSential
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eCSSential
✤ “Making responsive CSS load the way it should.”
✤ Downloads Blocking CSS that matches media
queries
✤ Downloads other CSS async, non-blocking
✤ https://github.com/filamentgroup/eCSSential
Thursday, November 8, 12
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matchMedia
if
(window.matchMedia("(min-‐width:
400px)").matches)
{
/*
the
view
port
is
at
least
400
pixels
wide
*/
}
else
{
/*
the
view
port
is
less
than
400
pixels
wide
*/
}
https://developer.mozilla.org/en-US/docs/DOM/window.matchMedia
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matchMedia
Polyfill: https://github.com/paulirish/matchMedia.js/
Careful with IE8-, the polyfill requires Media Query support
http://caniuse.com/#feat=matchmedia
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eCSSential
<!-‐-‐
Inline
eCSSential.min.js
-‐-‐>
eCSSential({
"all":
"css/all.css",
"(min-‐width:
20em)":
"css/min-‐20em.css",
"(min-‐width:
37.5em)":
"css/min-‐37.5em.css",
"(min-‐width:
50em)":
"css/min-‐50em.css",
"(min-‐width:
62.5em)":
"css/min-‐62.5em.css"
});
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eCSSential Demo
✤ http://filamentgroup.github.com/eCSSential/examples/concat/
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Images Don’t Block
✤ Doesn’t mean they get a free pass.
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Images Don’t Block
✤ Doesn’t mean they get a free pass.
753KB
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Downloading Images (CSS)
![]()
@media
all
and
(max-‐width:
600px)
{
#test1
{
display:none;
}
}
http://timkadlec.com/2012/04/media-query-asset-downloading-results/
Thursday, November 8, 12
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Downloading Images (CSS)
![]()
@media
all
and
(max-‐width:
600px)
{
#test1
{
display:none;
}
}
http://timkadlec.com/2012/04/media-query-asset-downloading-results/
NOPE
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Downloading Images (CSS)
#test2
{
background-‐image:url('images/test2.png');
width:200px;
height:75px;
}
@media
all
and
(max-‐width:
600px)
{
#test2
{display:none;}
}
http://timkadlec.com/2012/04/media-query-asset-downloading-results/
Thursday, November 8, 12
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Downloading Images (CSS)
#test2
{
background-‐image:url('images/test2.png');
width:200px;
height:75px;
}
@media
all
and
(max-‐width:
600px)
{
#test2
{display:none;}
}
http://timkadlec.com/2012/04/media-query-asset-downloading-results/
NOPE
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Downloading Images (CSS)
#test3
div
{
background-‐image:url('images/test3.png');
width:200px;
height:75px;
}
@media
all
and
(max-‐width:
600px)
{
#test3
{
display:none;
}
}
http://timkadlec.com/2012/04/media-query-asset-downloading-results/
Thursday, November 8, 12
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Downloading Images (CSS)
#test3
div
{
background-‐image:url('images/test3.png');
width:200px;
height:75px;
}
@media
all
and
(max-‐width:
600px)
{
#test3
{
display:none;
}
}
http://timkadlec.com/2012/04/media-query-asset-downloading-results/
OK
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Downloading Images (CSS)
#test4
{
background-‐image:url('images/test4-‐desktop.png');
width:200px;
height:75px;
}
@media
all
and
(max-‐width:
600px)
{
#test4
{
background-‐image:url('images/test4-‐mobile.png');
}
}
http://timkadlec.com/2012/04/media-query-asset-downloading-results/
Thursday, November 8, 12
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Downloading Images (CSS)
#test4
{
background-‐image:url('images/test4-‐desktop.png');
width:200px;
height:75px;
}
@media
all
and
(max-‐width:
600px)
{
#test4
{
background-‐image:url('images/test4-‐mobile.png');
}
}
http://timkadlec.com/2012/04/media-query-asset-downloading-results/
~OK
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Downloading Images (CSS)
#test7
{
background-‐image:url('images/test7-‐lowres.png');
width:200px;
height:75px;
}
@media
only
screen
and
(-‐webkit-‐min-‐device-‐pixel-‐ratio:
1.5),
only
screen
and
(min-‐-‐moz-‐device-‐pixel-‐ratio:
1.5),
only
screen
and
(-‐o-‐min-‐device-‐pixel-‐ratio:
3/2),
only
screen
and
(min-‐device-‐pixel-‐ratio:
1.5)
{
#test7
{
background-‐image:url('images/test7-‐highres.png');
width:200px;
height:75px;
/*
Editors
note:
this
should
use
background-‐size
*/
}
}
http://timkadlec.com/2012/04/media-query-asset-downloading-results/
Thursday, November 8, 12
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Downloading Images (CSS)
#test7
{
background-‐image:url('images/test7-‐lowres.png');
width:200px;
height:75px;
}
@media
only
screen
and
(-‐webkit-‐min-‐device-‐pixel-‐ratio:
1.5),
only
screen
and
(min-‐-‐moz-‐device-‐pixel-‐ratio:
1.5),
only
screen
and
(-‐o-‐min-‐device-‐pixel-‐ratio:
3/2),
only
screen
and
(min-‐device-‐pixel-‐ratio:
1.5)
{
#test7
{
background-‐image:url('images/test7-‐highres.png');
width:200px;
height:75px;
/*
Editors
note:
this
should
use
background-‐size
*/
}
}
http://timkadlec.com/2012/04/media-query-asset-downloading-results/
OK
Thursday, November 8, 12
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Downloading Images (CSS)
✤ Coming to a browser near you: image-‐set()
✤ http://blog.cloudfour.com/safari-6-and-chrome-21-add-image-set-to-
support-retina-images/
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Downloading ![]()
✤ RESPONSIVE IMAGES
✤ Whatever solution you pick, make sure it doesn’t
make duplicate requests.
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Downloading ![]()
✤ If possible, use Vectors (SVG) over Bitmaps
(PNG). It’ll look great on HDPI screens.
✤ Vectors are a shortcut for Responsive Images.
✤ Note: Canvas content is bitmapped, but you can
redraw at higher resolutions.
✤ Side Note: Font icons are a great scalable
alternative to PNG icons
Thursday, November 8, 12
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Picturefill
✤ “A Responsive Images approach that you can use today”
✤ https://github.com/scottjehl/picturefill
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Picturefill
![]()
http://scottjehl.github.com/picturefill/
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Picturefill
✤ data-‐media="(min-‐width:
400px)"
✤ Uses
matchMedia.
✤ No
duplicate
requests!
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Picturefill (HDPI)
...
http://scottjehl.github.com/picturefill/
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Compressive Images
✤ Pump up the size, pump up the JPEG compression
✤ Scale down in the browser
✤ http://filamentgroup.com/lab/rwd_img_compression/
Thursday, November 8, 12
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Picturefill Simplifes to (HDPI)
...
✤ Careful with Memory Consumption!
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Buzzkills
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Buzzkill #1: Advertising
✤ Pit of despair: full of document.write, iframes, blocking JavaScript
(errors galore) and general badness.
✤ Inject advertising iframes using JavaScript (after onload)
✤ document.createElement(‘iframe’);
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Buzzkill #2: Social Networking
Widgets
Network Requests Size (After GZIP)
ShareThis 19 98.9KB
Facebook 3 41.2KB
Twitter 5 48KB
Google+ 8 30.8KB
Compare to jQuery 1.8.2: 32KB
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SocialCount
✤ 4 KB CSS, 7KB JavaScript (unminified,
ungzipped)
✤ 2 requests, optional +1 for Counts
✤ Non-Blocking
✤ Sharing still works without JavaScript
✤ Initializes Native Widgets on Hover / Tap
for Inline +1 / Like and Tweet.
✤ In use on f2em.com
Thursday, November 8, 12
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SocialCount
✤ 4 KB CSS, 7KB JavaScript (unminified,
ungzipped)
✤ 2 requests, optional +1 for Counts
✤ Non-Blocking
✤ Sharing still works without JavaScript
Coming Soon
✤ Initializes Native Widgets on Hover / Tap
for Inline +1 / Like and Tweet.
✤ In use on f2em.com
Thursday, November 8, 12
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Showcase Showdown
Thursday, November 8, 12
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Boston Globe
1.31 MB
Advertising, Video Player, Web Fonts, Tracking and Analytics
Thursday, November 8, 12
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Disney.com
1.59 MB
Advertising, Web Fonts, Tracking and Analytics
Thursday, November 8, 12
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Starbucks
Thursday, November 8, 12
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Time.com
Thursday, November 8, 12
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Smashing Magazine
1.87 MB
Advertising, Web Fonts, Tracking and Analytics
Thursday, November 8, 12
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RWD & Performance
✤ “The fastest web site is the one with nothing on it.”
✤ We’re in the problem solving business.
✤ Solutions often require Code.
✤ jQuery and Cross Browser DOM API Compatibility
✤ Solve more problems than you create.
Thursday, November 8, 12