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Mobile Web Performance
Getting and Staying Fast!

@aaronpeters, Turbobytes
@andydavies, NCC Group
Mobile – Everybody is Using It
“At the beginning of 2013 mobile (excluding tablet)
accounted for 26% of our traffic, and we ended the
year with it contributing 33%.”!
Stuart McMillan, Schuh!
And Spending More
“Historically, mobile baskets have always been
lower value than desktop but just before
Christmas the difference was only about 6%”!
Stuart McMillan, Schuh!
User Expectations are High
“85% of mobile users expect sites to load at least
as fast or faster than sites on their desktop”!
Strangeloop Networks!
Mobile Pages are Growing!

http://mobile.httparchive.org/!
“We’ve remade the Internet in our image… obese.”

Jason Grigsby!
!

http://www.flickr.com/photos/mrtopher/1414159786
We’re relying on ever faster phones and networks!

!

http://www.flickr.com/photos/willposh/3825768273/
4G isn’t going to bail us out!

77.3M!
mobile
connections!

2-3M 4G!
connections!

Estimated 20% of connections will be LTE by end of 2017!
GSMA Intelligence + operators!
!

http://www.flickr.com/photos/endlisnis/174511509
So many devices… lots of variation!

!

http://www.flickr.com/photos/adactio/12674230513
Meet the $25 Smartphone!

!

http://www.flickr.com/photos/mozillaeu/12748349115
Differing Network Environments!
GPRS!

EDGE!

3G!

4G!

WiFi!

Faster, Lower Latency???!

Special networks…!
Conference, Hotel, Coffee shop WiFi!
Latency is a huge issue!
“In 2012, the average worldwide RTT to
Google is still ~100ms, and ~50-60ms within
the US.”!
“we are looking at 100-1000ms RTT range
on mobile”!
Ilya Grigorik!
http://www.igvita.com/2012/07/19/latency-the-new-web-performance-bottleneck/!
It’s not just about speed!
!

http://www.flickr.com/photos/fastjack/2943793818
3G Radio Resource Control!
Idle for 12s!
IDLE!

1-2s delay!!

1s delay!

CELL_DCH!

CELL_FACH!

Idle for 5s!

Exact timings vary and depend on carrier NOT device!
http://web.eecs.umich.edu/~fengqian/paper/3g_imc10.pdf!
Measuring mobile web performance!

http://www.flickr.com/photos/14516334@N00/286709039/
Navigation Timing API
9+

window.performance.timing;
	
  

http://goo.gl/x483FY !
Resource Timing API
not on iPad

10+
DNS and
Connect
times are
broken

http://goo.gl/afV9OD !

window.performance.getEntries();
	
  
First Paint time
window.chrome.loadTimes().firstPaintTime;	
  
	
  

9+

window.performance.msFirstPaint;	
  

Works on IE
Mobile?
Don’t know
…

	
  
firstPaintTime = ‘first time MozAfterPaint event fires’ window.performance.timing.navigationStart	
  
WebPagetest
WebPagetest

I built and
operate WPT.!
I am awesome.!

•  Best tool to analyze web performance!
•  Real browser, many locations around the globe!
•  IE6-11, Firefox, Chrome, Android, iPhone, iPad…!
•  Specify connection speeds, packet loss!
•  Extensive API (eg. multi-page testing)!
•  Run your own private instance!!
Appurify’s WebPagetest!
Many devices!
Many carrier
profiles!
All located in San
Francisco!

http://appurify.webpagetest.org !
!
https://androidwpt.appurify.com !

!
Chrome DevTools For Mobile

http://goo.gl/jfKyAN" " " "http://goo.gl/WS5N8E!
Finding the problems!

http://www.flickr.com/photos/chasblackman/6795013658/
nbcnews.com

Dulles, VA, Motorola G – Chrome, Shaped 3G (1.6 Mbps/768 Kbps, 300ms RTT)!
nbcnews.com
18.7 sec
Start Render Time!

344 !
Requests!

1523 KB
Total Transfer Size!

115 different domains !"
htc.com
htc.com
9.4 sec

7 .js files = 200 KB =
too much

Start Render Time!
>1 MB files !

77
Requests!

3,256 KB !
Total Transfer Size!
Solving the problems: make it faster!

http://www.flickr.com/photos/velacreations/5249327029/
> Minimize transfer size

Send less bytes… A LOT LESS!
Send text based files compressed

Savings: 10% – 80% !!!
!
Minimize image dimensions
Crunch images

Served by apple.com

Optimized with ImageOptim

380 KB

179 KB
Don’t send what is not needed
apple.com on Nexus 7!
!

370 KB
above fold
hero image

Same image in
higher res,
now 442 KB.
So why send
that first one??
Use vector graphics instead?!

SVG: 12 KB vs PNG: 86KB!
Icon fonts!
★ ★!
☆ ☆!
♥ ♥!
☁ ☁!
Heydings by Heydon Works!

“Bog Standard Font”!
Use CSS!
border-radius: 20px; !

background: linear-gradient(left, #f06, #ff0);!

Some combinations produce poor paint performance!
Webfonts? Maybe better not
4.5 seconds … blocking!!
> Minimize number of requests
> Increase initcwnd
initial congestion window is a server parameter!
initcwnd	
  =	
  10	
  means server sends initially 10
packets (~14KB) over a TCP connection!
Default value is 10 in Linux 2.6.39+!

!

Most CDNs use 10, but some as high as 26!
> Increase initcwnd
A higher initcwnd really helps, especially with small
object delivery!

http://goo.gl/ee0xBs !
> Cache aggressively
Fonts, Stylesheets, JavaScript block rendering!
!

http://www.flickr.com/photos/timo/3995227
???!
CSS!

http://mobile.httparchive.org/!
Javascript!

http://mobile.httparchive.org/!
Added 160kB to page
Bounce rate increased by 12% on
mobile
!

https://speakerdeck.com/lara/design-for-performance!
We’ve fallen in love with web fonts!

!

http://www.flickr.com/photos/splorp/4951916342
But at what cost?!
Use of Web Fonts is Growing!

http://mobile.httparchive.org/!
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ĿŀŁłŃńŅņŇňʼnŊŋŌōŎŏŐőŒœŔŕŖŗŘřŚśŜŝŞşŠšŢţŤťŦŧ
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ΡΣΤΥΦΧΨΩΪΫάέήίΰαβγδεζηθικλμνξοπρςστυφχψωϊϋό
ύώϑϒϖЀЁЂЃЄЅІЇЈЉЊЋЌЍЎЏАБВГДЕЖЗИЙКЛМНО
ПРСТУФХЦЧШЩЪЫЬЭЮЯабвгдежзийклмнопрстуф
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ҖҗҘҙҚқҜҝҞҟҠҡҢңҤҥҦҧҨҩҪҫҬҭҮүҰұҲҳҴҵҶҷҸҹҺһҼ
ҽҾҿӀӁӂӃӄӅӆӇӈӉӊӋӌӍӎӏӐӑӒӓӔӕӖӗӘәӚӛӜӝӞӟӠӡӢ
ӣӤӥӦӧӨөӪӫӬӭӮӯӰӱӲӳӴӵӶӷӸӹӺӻӼӽӾӿԀԁԂԃԄԅԆԇԈ
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!
ỗỘộỚớỜờỞởỠỡỢợỤụỦủỨứỪừỬửỮữỰựỲỳỴỵỶỷỸỹὍ
–—―‗‘’‚‛“”„†‡•…‰′″‹›‼⁄⁰⁴⁵⁶⁷⁸⁹ⁿ₣₤₧₫€℅ℓ№℠™Ω℮⅛⅜
⅝ ⅞ ∂ ∆ ∏ ∑ − √ ∞ ∫ ≈ ≠ ≤ ≥ ◊ ff fi fl ffi ffl  !

Do we need all those font glyphs?
Open Sans — 22.1 kB
!"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJK
LMNOPQRSTUVWXYZ[]^_`abcdefghijklmnopqrstu
vwxyz{|}~ ¡¢£¤¥¦§¨©ª«¬­®¯°±²³´µ¶·¸¹º»¼½¾¿ÀÁÂ
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ĒēĔĕĖėĘęĚěĜĝĞğĠġĢģĤĥĦħĨĩĪīĬĭĮįİıIJijĴĵĶķĸĹĺĻļĽľ
ĿŀŁłŃńŅņŇňʼnŊŋŌōŎŏŐőŒœŔŕŖŗŘřŚśŜŝŞşŠšŢţŤťŦŧ
ŨũŪūŬŭŮůŰűŲųŴŵŶŷŸŹźŻżŽžſƒƠơƯưǰǺǻǼǽǾǿȘș
Țțȷʼˆˇˉ˘˙˚˛˜˝˳̣̀́̃̉̏΄΅Ά·ΈΉΊΌΎΏΐΑΒΓΔΕΖΗΘΙΚΛΜΝΞΟΠ
ΡΣΤΥΦΧΨΩΪΫάέήίΰαβγδεζηθικλμνξοπρςστυφχψωϊϋό
ύώϑϒϖЀЁЂЃЄЅІЇЈЉЊЋЌЍЎЏАБВГДЕЖЗИЙКЛМНО
ПРСТУФХЦЧШЩЪЫЬЭЮЯабвгдежзийклмнопрстуф
хцчшщъыьэюяѐёђѓєѕіїјљњћќѝўџѠѡѢѣѤѥѦѧѨѩѪѫ
ѬѭѮѯѰѱѲѳѴѵѶѷѸѹѺѻѼѽѾѿҀҁ҂҃҄҅҆҈҉ҊҋҌҍҎҏҐґҒғҔҕ
ҖҗҘҙҚқҜҝҞҟҠҡҢңҤҥҦҧҨҩҪҫҬҭҮүҰұҲҳҴҵҶҷҸҹҺһҼ
ҽҾҿӀӁӂӃӄӅӆӇӈӉӊӋӌӍӎӏӐӑӒӓӔӕӖӗӘәӚӛӜӝӞӟӠӡӢ
ӣӤӥӦӧӨөӪӫӬӭӮӯӰӱӲӳӴӵӶӷӸӹӺӻӼӽӾӿԀԁԂԃԄԅԆԇԈ
ԉԊԋԌԍԎԏԐԑԒԓḀḁḾḿẀẁẂẃẄẅẠạẢảẤấẦầẨẩẪẫẬậẮ
!
ắẰằẲẳẴẵẶặẸẹẺẻẼẽẾếỀềỂểỄễỆệỈỉỊịỌọỎỏỐốỒồỔổỖ
ỗỘộỚớỜờỞởỠỡỢợỤụỦủỨứỪừỬửỮữỰựỲỳỴỵỶỷỸỹὍ
–—―‗‘’‚‛“”„†‡•…‰′″‹›‼⁄⁰⁴⁵⁶⁷⁸⁹ⁿ₣₤₧₫€℅ℓ№℠™Ω℮⅛⅜
⅝ ⅞ ∂ ∆ ∏ ∑ − √ ∞ ∫ ≈ ≠ ≤ ≥ ◊ ff fi fl ffi ffl  !

14.9 kB — 33% saving
!"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJK
LMNOPQRSTUVWXYZ[]^_`abcdefghijklmnopqrstu
vwxyz{|}~ ¡¢£¤¥¦§¨©ª«¬­®¯°±²³´µ¶·¸¹º»¼½¾¿ÀÁÂ
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ĿŀŁłŃńŅņŇňʼnŊŋŌōŎŏŐőŒœŔŕŖŗŘřŚśŜŝŞşŠšŢţŤťŦŧ
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ΡΣΤΥΦΧΨΩΪΫάέήίΰαβγδεζηθικλμνξοπρςστυφχψωϊϋό
ύώϑϒϖЀЁЂЃЄЅІЇЈЉЊЋЌЍЎЏАБВГДЕЖЗИЙКЛМНО
ПРСТУФХЦЧШЩЪЫЬЭЮЯабвгдежзийклмнопрстуф
хцчшщъыьэюяѐёђѓєѕіїјљњћќѝўџѠѡѢѣѤѥѦѧѨѩѪѫ
ѬѭѮѯѰѱѲѳѴѵѶѷѸѹѺѻѼѽѾѿҀҁ҂҃҄҅҆҈҉ҊҋҌҍҎҏҐґҒғҔҕ
ҖҗҘҙҚқҜҝҞҟҠҡҢңҤҥҦҧҨҩҪҫҬҭҮүҰұҲҳҴҵҶҷҸҹҺһҼ
ҽҾҿӀӁӂӃӄӅӆӇӈӉӊӋӌӍӎӏӐӑӒӓӔӕӖӗӘәӚӛӜӝӞӟӠӡӢ
ӣӤӥӦӧӨөӪӫӬӭӮӯӰӱӲӳӴӵӶӷӸӹӺӻӼӽӾӿԀԁԂԃԄԅԆԇԈ
ԉԊԋԌԍԎԏԐԑԒԓḀḁḾḿẀẁẂẃẄẅẠạẢảẤấẦầẨẩẪẫẬậẮ
!
ắẰằẲẳẴẵẶặẸẹẺẻẼẽẾếỀềỂểỄễỆệỈỉỊịỌọỎỏỐốỒồỔổỖ
ỗỘộỚớỜờỞởỠỡỢợỤụỦủỨứỪừỬửỮữỰựỲỳỴỵỶỷỸỹὍ
–—―‗‘’‚‛“”„†‡•…‰′″‹›‼⁄⁰⁴⁵⁶⁷⁸⁹ⁿ₣₤₧₫€℅ℓ№℠™Ω℮⅛⅜
⅝ ⅞ ∂ ∆ ∏ ∑ − √ ∞ ∫ ≈ ≠ ≤ ≥ ◊ ff fi fl ffi ffl  !

8.3 kB — 62% saving
Provide hints before a resource is discovered!
<link rel="dns-prefetch" href="other.hostname.com">
<link rel="subresource" href="/some_other_resource.js">
<link rel="prefetch" href="/some_other_resource.jpeg">
<link rel="prerender" href="//domain.com/next_page.html">
Prioritise the Content!
Guardian divide page into:	

	

- Content	

- Enhancements	

- Leftovers
What can we put off until later?!

!

http://www.flickr.com/photos/melodramababs/5962771148
https://speakerdeck.com/mikeyk/secrets-to-lightning-fast-mobile-design!
Network request!
still in progress!

User gets !
feedback!
Magic, the Art of Misdirection!

!

http://www.flickr.com/photos/nozzer/3990622685
http://mercury.io/blog/the-psychology-of-waiting-loading-animations-and-facebook!
Embrace Constraints… Set a budget!

!

http://www.flickr.com/photos/communityfriend/2342578485
Embrace Constraints… Set a budget!
“Usable within 10 seconds on GPRS connection” - BBC News!

“SpeedIndex under 1000” - Paul Irish, Google!

Requests, page size etc. are easier to measure but may not
represent real world experience!

!

http://www.flickr.com/photos/communityfriend/2342578485
For a faster mobile site:!
" 
" 
" 
" 
" 

Measure	

Move less bytes	

Prioritise what you move	

Move them while no-one is looking	

Distract the visitor!!
Thank You!
!

@aaronpeters
	

	


aaron@turbobytes.com	


@andydavies
	

	


andy.davies@nccgroup.com	


	

http://slideshare.net/andydavies!
!

http://www.flickr.com/photos/nzbuu/4093456029

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