Web Performance

Web developers using high amounts of domain sharding to work around low connection per host limits in old browser should reconsider their number of shards for newer browsers. Anything over 2 is probably too much, unless most of your user base is using older browsers.

Refactoring Trulia's UI with SASS, OOCSS, and handlebars. My slides from jsconf 2013. Lot's of yummy details about the performance improvements we were able to make. By Nicole Sullivan

"Les outils pour mesurer / comprendre sont plutôt reconnus désormais et arrivent a une certaine maturité. Il y a toutefois encore un créneau plutôt peu documenté (à mon goût) dans le domaine, celui permettant de mesurer les temps de chargement dans des applications mobile natives (Android / iOs ...)"

"WebPagetest will now expose any User Timing marks that a page records so you can use the same custom events for your synthetic test measurement as well as your Real User Measurement"

I shouldn't need to explain the importance of front-end performance at this point; after two previous posts, 9 Ways to Optimize Your Front End Performance and...

Vidéo: http://www.youtube.com/watch?v=YV1nKLWoARQ

"Here are some common mistakes we see on smartphone-optimized websites and how to avoid them."

"Google mobile search is getting faster - to be exact, 200-400 milliseconds faster! We are gradually rolling out this improvement to all browsers that support the attribute (currently, mobile Chrome and Safari)."

I've started experimenting with my home page to make it load even faster. Amazon famously does this too which you can read more about in this Steve Souders post. They make sure everything that needs to be visible above the fold is loaded first, then, it starts loading all the other "stuff" below the fold.

Assez d'accord avec les commentaires , il faut éviter que le crawler passe sur la ressource dédiée au chargement des huits autres articles, sinon il y a un risque de duplicate content. Pour éviter cela il faut gérer des règles pour robots.txt, est-ce suffisant ? Le découpage je le fais plutôt au niveau du styling CSS et JS. J'inclue le style css indispensable à l'affichage et charge le reste . Bref il y aussi le risque de reflow dans ce cas.

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When we look back over the history of web performance we see a heavy focus on reducing the number of requests and getting files to the browser quickly. Our platform has changed a lot, and while optimizing for network performance remains a crucial part of our jobs, we now have to broaden our performance horizons. Our users also expect smooth scrolling, animations and interactions, even on mobile devices. In short we need to deal with not just how quickly our sites and apps load, but also how quickly they run. [video] In this session Paul takes a lightning tour of how Chrome converts the DOM into pixels, see how our code affects its workload, and arrive at a modern workflow for finding (and eliminating) rendering bottlenecks.

Support de présentation de Gonzalo Ruiz de Villa à l'occasion de #spainjs 2013

pngquant 2 applies vector quantization algorithm to optimise image colour palette with the least amount of loss as possible.