+ Follow

JavaScript - Optimising Where it Hurts (Jake Archibald)

by Jake Archibald on Nov 16, 2009

19,002 views

As the amount of JavaScript we use on our pages increases, as does its effect on page performance. Even when browsers manage to produce the same output, how they reach that output can be very ...

As the amount of JavaScript we use on our pages increases, as does its effect on page performance. Even when browsers manage to produce the same output, how they reach that output can be very different. Some optimisations aren’t obvious, others can be easily broken by seemingly unrelated statements. So, how do we get the most out of our code?

This presentation challenges assumptions about performance, using practical code to demonstrate the optimisations that really make a difference, and why they make a difference.

Accessibility

View text version

Upload Details

Uploaded via SlideShare as Adobe PDF

Usage Rights

File a copyright complaint

26 Embeds 333

http://dears.tumblr.com	170
http://www.slideshare.net	54
http://lanyrd.com	39
http://overinsideout.blogspot.com.br	8
http://talksathome.com	7
http://safe.tumblr.com	6
http://overinsideout.blogspot.com	6
https://twitter.com	6
http://notundefined.tumblr.com	5
http://twitter.com	5
http://blog.livedoor.jp	5
http://localhost	4
http://onwebdev.blogspot.com	3
http://livedoor.blogcms.jp	2
http://hi.chibaole.com	2
http://onwebdev.blogspot.com.es	1
http://blog.gabrieleromanato.com	1
http://overinsideout.blogspot.pt	1
http://lanyrd.dev	1
http://a0.twimg.com	1
http://trunk.ly	1
http://zootool.com	1
https://p.yammer.com	1
http://static.slidesharecdn.com	1
file://	1
http://overinsideout.blogspot.it	1

More...

Statistics

Likes: 57
Downloads: 402
Comments: 7
Embed Views: 333
Views on SlideShare: 18,669
Total Views: 19,002

Diederik van der Boor, Software developer, entrepreneur at Edoburu Going from page 116 to 117 + 118 is downright stunning, yet very scary. 1 year ago

Are you sure you want to

Jake Archibald, Web Developer at lanyrd Agreed, my first draft of the presentation had that stuff in, but got cut due to time 2 years ago

Mathias Bynens, Freelance front-end developer at Qiwi I realize this presentation has been posted 2 years ago, but here’s some feedback from the future :)

As browsers and devices get faster, benchmarks that use fixed iteration counts have a greater chance of producing 0 ms results, which are unusable. Luckily, better alternatives are available. See http://calendar.perfplanet.com/2010/bulletproof-javascript-benchmarks/

Nowadays, for easy and reliable cross-browser performance testing you could just create a (private) jsPerf test case: http://jsperf.com/ 2 years ago

Alexsandro Pereira, Software Developer at Actcon Good bitwise explanation 3 years ago

Jake Archibald, Web Developer at lanyrd Yeah, I'll sync the audio to the slides here 3 years ago

Amit Ranjan, CoFounder at SlideShare jake,

you could convert this into a slidecast by adding the audio mp3 file and synching it to the slides...

also if there is a youtube video to go along, that can be embedded in the presentationas well (also embedded in the comments) 3 years ago

Jake Archibald, Web Developer at lanyrd Some of the sentiment of the presentation is missing without audio. A few of the optimisations shown here aren't always worth making.

I'll attach the audio after the recording at http://2009.full-frontal.org/ 3 years ago