The document provides tips for improving mobile web performance including reducing page load and weight, optimizing images, using CSS sprites and minified scripts, testing performance on mobile devices, and leveraging tools to debug mobile websites remotely. It also recommends strategies like lazy loading images, reducing HTTP requests, using more performance tests and frameworks, and investigating data URIs and offline storage.

1. (Mobile) Web Performance

2.  Reducethe page load /page weight as
much as possible

3.  http://developer.yahoo.com/performance/ru
les.html
• Minimize HTTP requests
• Put CSS at top of page
• Put JavaScript scripts at bottom of page
• Avoid images where possible and/or optimize images:
FIFA Scoreboard, use gradient
tr.game{
background: #434343; /* IE default */
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#434343',
endColorstr='#171717');
background: -webkit-gradient(linear, left top, left bottom, from(#434343),
to(#171717)); /* for webkit browsers */
background: -moz-linear-gradient(top, #434343, #171717);
}

4.  Use Image sprites, e.g. PG:
http://www.cbc.ca/m/touch/pg.html
http://www.cbc.ca/m/touch//img/sprite_pg.pn
g
 Use minified scripts, i.e. js, css (YSlow),
e.g. http://cbc.ca/m/touch/js/core.js

5.  Test Web Performance on your mobile device:
http://www.blaze.io/mobile/
 Web Site Performance: http://www.webpagetest.org/
 Show Slow: Chrome App: http://bit.ly/leaBX0
 Web Inspector Remote (weinre), very nice way to debug your mobile
device remotely (Demo: http://bit.ly/flvhDk), Velocity Demo, 00:15min
http://bit.ly/is9sDo
 HTTP Archive http://httparchive.org/about.php
 CSSLint: http://csslint.net/

6.  MobilePerf Bookmarklet: http://p.ad.ag/
 YSlowMobile Bookmarklet:
http://developer.yahoo.com/yslow/mobile
 Jdrop Bookmarklet: http://jdrop.org/

7.  DataURIs: http://css-tricks.com/5970-
data-uris/
 CSS: Use hex for icons
http://pukupi.com/post/1964
 PhantomJS: Command-line JS Tool,
http://www.phantomjs.org/

8.  Max Firtman’s Sim/Emulator page:
http://www.mobilexweb.com/emulators
 Remote Labs
• http://deviceanywhere.com
• http://perfectomobile.com

9.  Google Chrome Instant:
http://www.google.com/support/chrome/bin/answ
er.py?answer=177873
Video, 04:18min, http://bit.ly/mNnqu8
 Alexa 100: http://www.alexa.com/topsites
• For Canada:
http://www.alexa.com/topsites/countries/CA
 SPDY vs. HTTP:
http://www.chromium.org/spdy/spdy-whitepaper

10.  Lazy loading: Transfer data when needed and preload
where appropriate. Don't load images that will never be
seen by the end user
 Reduce HTTP requests, more CSS sprites
 Use more web performance tests
 More mobile web frameworks
 Investigate usage of data URI for images
 Offline storage/local cache
 Evaluate metrics code (see WebPagetest.org results)

11.  All slides & videos from Velocityconf 2011
• http://velocityconf.com/velocity2011/public/schedule/proceedings
 YouTube: http://www.youtube.com/user/OreillyMedia
 John Resig on JS performance:
http://www.youtube.com/watch?feature=player_embedde
d&v=WuMEQN7aph0
 Facebook, Infrastructure
http://www.youtube.com/watch?v=urG0dQ7kc3w&feature
=player_embedded
 Most of those projects are open source and can be found
on github