Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Faster Responsive Websites
Search
14islands
May 07, 2014
Programming
2
330
Faster Responsive Websites
Talk from the JavaScript meetup 7th of May in Reykjavík, Iceland
14islands
May 07, 2014
Tweet
Share
More Decks by 14islands
See All by 14islands
Construindo interfaces interativas com React
14islands
0
77
Sneaky Santa
14islands
0
54
Innovation & Prototyping
14islands
0
170
Google Santa Tracker: Present Bounce
14islands
0
240
Responsive Web Design Recap
14islands
8
1.4k
Lessons learned using WordPress as a CMS
14islands
2
960
The good, the bad and the ugly with responsive web design
14islands
4
1.9k
Performance as design: doing responsive responsibly
14islands
32
8k
Other Decks in Programming
See All in Programming
Cline指示通りに動かない? AI小説エージェントで学ぶ指示書の書き方と自動アップデートの仕組み
kamomeashizawa
1
560
A2A プロトコルを試してみる
azukiazusa1
2
800
業務自動化をJavaとSeleniumとAWS Lambdaで実現した方法
greenflagproject
1
120
エラーって何種類あるの?
kajitack
5
270
たった 1 枚の PHP ファイルで実装する MCP サーバ / MCP Server with Vanilla PHP
okashoi
0
120
AIエージェントはこう育てる - GitHub Copilot Agentとチームの共進化サイクル
koboriakira
0
140
明示と暗黙 ー PHPとGoの インターフェイスの違いを知る
shimabox
1
120
GoのGenericsによるslice操作との付き合い方
syumai
2
670
Create a website using Spatial Web
akkeylab
0
290
Elixir で IoT 開発、 Nerves なら簡単にできる!?
pojiro
1
150
GoのWebAssembly活用パターン紹介
syumai
3
10k
XSLTで作るBrainfuck処理系
makki_d
0
210
Featured
See All Featured
Put a Button on it: Removing Barriers to Going Fast.
kastner
60
3.9k
Fashionably flexible responsive web design (full day workshop)
malarkey
407
66k
The Art of Delivering Value - GDevCon NA Keynote
reverentgeek
15
1.5k
Responsive Adventures: Dirty Tricks From The Dark Corners of Front-End
smashingmag
252
21k
Design and Strategy: How to Deal with People Who Don’t "Get" Design
morganepeng
130
19k
Fireside Chat
paigeccino
37
3.5k
Reflections from 52 weeks, 52 projects
jeffersonlam
351
20k
Refactoring Trust on Your Teams (GOTO; Chicago 2020)
rmw
34
3k
VelocityConf: Rendering Performance Case Studies
addyosmani
330
24k
The Pragmatic Product Professional
lauravandoore
35
6.7k
BBQ
matthewcrist
89
9.7k
Documentation Writing (for coders)
carmenintech
71
4.9k
Transcript
None
FASTER RESPONSIVE WEBSITES
This talk is not about How to build a rocket-ship
with Javascript
This talk is about Techniques to make our websites faster
THE PROBLEM
“75% of mobile users will leave the site if it
takes more than 5 seconds to load. http://www.digitalmall.us/1150/smartphone-users-frustrated-with-mobile-web-experience/
None
“Today the average website is 1.7MB httparchive.org/interesting.php
http://httparchive.org/interesting.php?a=All&l=Oct%201%202013&s=Top1000 AVG. SITE 0 1 2 <1mb 2011 1.5mb 2013
2mb 2015 AVG. SITE 0 1 2 AVG. SITE 0 1 2
None
None
“87% of mobile users expect sites to load at least
as fast, or faster than on their desktop. http://www.strangeloopnetworks.com/web-performance-infographics/
None
None
None
LET’S START WITH A PAGE BUDGET
None
Example: Less than 3 seconds to see something.
Example: Not bigger than 1MB.
Example: No more than 20 requests.
Now try to stick to it. (good luck!)
USING ONLINE TOOLS SUCH AS WEBPAGETEST.ORG
None
None
Coffee image
None
– Paul Lewis “The Speed Index is the average time
at which visible parts of the page are displayed. http://aerotwist.com/blog/my-performance-audit-workflow/
– Paul Lewis “Paul Irish has, in the past, recommended
a goal of less than 1,000. http://aerotwist.com/blog/my-performance-audit-workflow/
Filmstrip
OLD-SCHOOL IS STILL COOL PROGRESSIVE ENHANCEMENT
None
– Jake Archibald “All your users are non-JS while they're
downloading your JS. https://twitter.com/jaffathecake/status/207096228339658752
Twitter.com dropped initial page load to 1/5th by moving rendering
to server. https://blog.twitter.com/2012/improving-performance-twittercom
Airbnb experimented serving real HTML instead of JS and it
felt 5x quicker. http://nerds.airbnb.com/weve-launched-our-first-nodejs-app-to-product/
None
http://www.flickr.com/photos/not-so-much/2819702177/
TV FRIDGE CAR
MOBILE-LAST
Breakpoints are enhancements
MOBILE-FIRST
DELAY LOAD OF SECONDARY CONTENT
Core content Secondary Secondary
Core content Secondary Secondary
Core content Secondary Secondary
var deferred = $.get("/partial"); ! deferred.done(function (html) { $wrapper.html(html); });
Real life example: Press Jack - article nav / next
article
Lazy load images
None
https://github.com/ sakabako/scrollMonitor
var watcher = scrollMonitor.create(context, offset); ! watcher.enterViewport(loadImages);
<img data—lazy-src="http://path/to/image.jpg" />
<img src="http://path/to/image.jpg" />
OPTIMISING RESPONSIVE IMAGES
Biggest performance hit 69% of mobile web traffic
Serve images in the correct sizes. Please.
CSS background images
.thing { background-image: url('images/small.png'); } ! @media (min-width: 30em) {
.thing { background-image: url('images/medium.png'); } }
Note: Not for content images
Proposed <picture> spec
<picture> <source media="(min-width: 40em)" srcset="big.jpg 1x, big-hd.jpg 2x"> <source srcset="small.jpg
1x, small-hd.jpg 2x"> <img src="fallback.jpg" alt=""> </picture>
http://ericportis.com/posts/2014/srcset-sizes/
<img src="small.jpg" srcset="large.jpg 1024w, medium.jpg 640w, small.jpg 320w" sizes="(min-width: 36em)
33.3vw, 100vw" /> Available images and their width Breakpoints in CSS and image width relative to the viewport
http://responsiveimages.org
None
https://github.com/ scottjehl/picturefill Version 2.0
front-end & back-end Javascript
<img data-src="http://path/to/image.jpg" />
var imageWidth = image.offsetWidth * window.devicePixelRatio; ! var src =
“http://hej.se/image.jpg?w=“ + imageWidth; ! image.setAttribute("src", src);
Check browser for size and capabilities
Check browser for size and capabilities Request CDN
Do we have this image? Check browser for size and
capabilities Request CDN
Return the image Do we have this image? Check browser
for size and capabilities Request CDN
Prepare the image Return the image Do we have this
image? Check browser for size and capabilities Request CDN
Prepare the image Return the image Return the image Do
we have this image? Check browser for size and capabilities Request CDN
None
THE AWESOMENESS OF SCALE VECTOR GRAPHICS
None
SVG 4KB uncompressed PNG 10KB uncompressed
And it’s only markup text
Summary ! ! ! ! !
Summary Be aware. Set a "budget". ! ! !
Summary Be aware. Set a "budget". Progressive Enhancement is still
cool. ! ! ! !
Summary Be aware. Set a "budget". Progressive Enhancement is still
cool. Prioritise loading of content with JS. ! ! ! !
Summary Be aware. Set a "budget". Progressive Enhancement is still
cool. Prioritise loading of content with JS. Images are the biggest hit. ! ! !
Summary Be aware. Set a "budget". Progressive Enhancement is still
cool Prioritise loading of content with JS. Images are the biggest hit. SVGs are awesome. ! !
Summary Be aware. Set a "budget". Progressive Enhancement is still
cool Prioritise loading of content with JS. Images are the biggest hit. SVGs are awesome. ! !
Think and prioritise performance from day one.
“Measure. Treat performance as a core part of your site’s
quality and don’t ship without understanding and accepting it’s performance. http://www.guypo.com/mobile/performance-implications-of-responsive-design-book-contribution/
There are techniques
We need to care more
None
Takk ! ! http://twitter.com/14islands ! http://facebook.com/14islands