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"Calculate visual performance metrics from a video (Speed Index, Visual Complete, Incremental progress, etc). This is a command-line port of the WebPagetest mobile video processing and metrics code."

Retrouvez une sélection de liens sur le thème des performances Web de la semaine passée. Au sommaire, 13 liens sur : la haute dispo chez Google, webperf sur mobile, retour sur HTTPS, l'impact des raccourcisseurs d'url, les performances des designs responsive, …

"I did some research about how images are downloaded when media queries are involved. I wrote up some automated tests where Javascript could determine whether or not the image was requested. I've got enough data now to be able to go into detailed findings."

Itw by M. Hendrickson Current state of the Performance and Operations market. Terms, semantics and DevOps, are we splitting hairs? What do performance people do on a daily basis? Do you need to tradeoff anything to get better performance? Are most websites acceptable when it comes to speed? Measuring slowness -- clarified and demystified Where do you find performance monitoring tools? How do you know if you have a fast enough web site? Does Mobile disrupt your quest for high performance? Does HTML5 add any more complexity challenges to high performance web sites? Wrap up and discussion of Velocity Conference

"Slowy is a tool which simulates custom connection's conditions and limits the network traffic to a specified destination port. It is created for web developers, like me, who need to test a website with a real-world connection, even on a local server. Slowy is an OSX MenuBar app, so it is lightweight and is placed only on the system topbar. "

Un tour du comportement et des tailles des icônes de pages sur les iOS et Android.

My previous blog post, Cache them if you can, suggests that current cache sizes are too small - especially on mobile. Given this concern about cache size a relevant question is: If a response is compressed, does the browser save it compressed or uncompressed? Compression typically reduces responses by 70%.

SPDY is awesome. It's the first real upgrade to HTTP in 10+ years, it tackles high latency mobile networks performance issues and it makes the web more secure. SPDY is different than HTTP in many ways, but its primary value comes from being able to multiplex many requests/responses from client to server over a single (or few) TCP connections.

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

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

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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.

RWDPerf - Performance testing tool for Responsive web designs.