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Improving Performance with Responsive Images [W...
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newtron
January 22, 2014
Programming
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Improving Performance with Responsive Images [WebPerfTO]
Toronto Web Performance Group
January 22, 2014
https://github.com/nwtn/pres-respimg-perf
newtron
January 22, 2014
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Transcript
@towebperf Tweet! #towebperf ! ! DAVID NEWTON (@NEWTRON) RESPONSIVE IMAGES
BLAKE CROSBY (@BLAKECROSBY) THE IMPORTANCE OF A CDN HELLO! & Review!
Improving Performance with Responsive Images Toronto Web Performance Group January
22, 2014
None
–Brad Frost “Good performance is good design”
None
None
None
–Anand Giridharadas, New York Times, April 10 2010 “More human
beings today have access to a cellphone than the United Nations says have access to a clean toilet.”
–Anand Giridharadas, New York Times, April 10 2010 “More human
beings today have access to a cellphone than the United Nations says have access to a clean toilet.”
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1. A flexible, grid-based layout, 2. Flexible images and media,
and 3. Media queries, a module from the CSS3 specification
1. A flexible, grid-based layout, 2. Flexible images and media,
and 3. Media queries, a module from the CSS3 specification
img { max-width: 100%; }
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None
A solution Serve one big image and let the browser
scale it
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• Average web page size: 1,681 KB • Images account
for 1,031 KB, over 61% of total ! HTTP Archive, January 15 2014
2x resolution = 4x as many pixels
–Brad Frost “Good performance is good design”
A better solution Serve an appropriately-sized image to each user
Responsive Images
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SVG, WebP, JPEG XR
• <picture>: http://picture.responsiveimages.org/ • srcset: http://www.w3.org/html/wg/drafts/srcset/ w3c-srcset/ • Client Hints:
http://tools.ietf.org/html/draft-grigorik- http-client-hints-01
<picture> <source srcset="pic1x.jpg 1x, pic2x.jpg 2x, pic4x.jpg 4x"> <img alt="A
rad wolf." src="pic1x.jpg"> </picture>
<picture> <source media="(min-width: 45em)" src="large.jpg"> <source media="(min-width: 18em)" src="med.jpg"> <img
src="small.jpg" alt="The president."> </picture>
<picture> <source media="(min-width: 45em)" srcset="large-1.jpg 1x, large-2.jpg 2x"> <source media="(min-width:
18em)” srcset="med-1.jpg 1x, med-2.jpg 2x"> <source srcset="small-1.jpg 1x, small-2.jpg 2x"> <img src="small-1.jpg" alt="The president."> </picture>
<picture> <source sizes="100%" srcset="pic400.jpg 400w, pic800.jpg 800w, pic1600.jpg 1600w"> <img
src="pic400.jpg" alt="The president."> </picture>
<picture> <source type="image/webp" src="prez.webp"> <img src="prez.jpg" alt="The president."> </picture>
http://picture.responsiveimages.org/
Performance wins
None
None
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Resource Priorities http://www.w3.org/TR/resource-priorities/
When can we expect this to work?
What can you do now?
ImageOptim-CLI http://jamiemason.github.io/ImageOptim-CLI/
Use fewer images
SVG
Picturefill https://github.com/scottjehl/picturefill
• Art direction • Viewport switching (using MQs) • DPR
switching (using MQs)
<span data-picture data-alt="A giant stone face"> <span data-src="small.jpg"></span> <span data-src="medium.jpg"
data-media="(min-width: 400px)"></span> <span data-src="large.jpg" data-media="(min-width: 800px)"></span> <span data-src="extralarge.jpg" data-media="(min-width: 1000px)"></span> <noscript> <img src="small.jpg" alt="A giant stone face"> </noscript> </span>
data-media="(min-device-pixel-ratio: 1.5), (min-resolution: 144dpi)"
• Art direction • Viewport switching (using MQs) • DPR
switching (using MQs) • Resolution switching (using srcset) • File type switching • Resource priorities
• Art direction • Viewport switching (using MQs) • DPR
switching (using MQs) • DPR switching (using srcset) • File type switching • Resource priorities
Picturefull https://github.com/nwtn/picturefill
<span data-picture data-postpone data-alt="A giant stone face"> <span data-type="image/webp" data-srcset="
[email protected]
1x,
[email protected]
2x"></span> <span data-type="image/webp" data-srcset="medium.webp@1x 1x, medium.webp@2x 2x" data-media="(min-width: 400px)"></span> ... <span data-srcset="
[email protected]
1x,
[email protected]
2x"></span> <span data-srcset="medium.jpg@1x 1x, medium.jpg@2x 2x" data-media="(min-width: 400px)"></span> ... <noscript> <img src="
[email protected]
" alt="A giant stone face"> </noscript> </span>
Impact
None
No optimizations • 11 HTTP requests • 2.9MB of data
transferred • 3.72s load time
No optimizations • 11 HTTP requests • 2.9MB of data
transferred • 3.72s load time
Optimizations • 14 HTTP requests • 476KB of data transferred
(~84% savings) • 1.26s load time (~66% savings)
Optimizations • 14 HTTP requests • 476KB of data transferred
(~84% savings) • 1.26s load time (~66% savings)
Optimizations + RP • 5 HTTP requests • 235KB of
data transferred (~92% savings) • 1.11s load time (~70% savings)
Optimizations + RP • 5 HTTP requests • 235KB of
data transferred (~92% savings) • 1.11s load time (~70% savings)
None
None
None
David Newton! @newtron on Twitter @nwtn on GitHub
[email protected]