Web Performance

"I've worked on projects where some of the devices we needed to test on couldn't load the page at all if jQuery was present-it was just too much JavaScript for the device to handle."

"Does combining the media queries have any actual performance improvements? Are people simply raising issue because they don't like the way the output CSS looks? That's a damn good question and one that Aaron also raised. As he put it, "Let's ask science!""

"A grunt task which takes a html file, finds all the css and js links, and outputs a version with all the css and js written inline for ease of pasting into a cms"

"In current implementations as of August 2012, no popular user agent pre-fetches resources that are subject to media queries until those media queries are satisfied. However, it seems like a more intelligent approach could be taken based on the liklihood that the media query may be satisfied at some point after a page has loaded. "

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

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

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.

"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)."

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

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

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...

"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"

"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 ...)"

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