Web Performance

Before we start, I'd like to mention that most (if not all) of these notes apply best to large, complex applications. Documents that have thousands of elements and that are highly interactive will benefit the most. In my case, I reduced page load time by ~650ms (~500ms (!)

Quelques bons conseils (les mêmes que d'hab) sur l'écriture universelle des CSS. Pas trop d'accord en revanche sur les raisons de ne pas utiliser les sélecteurs sur attribut - juste pour des raisons de compatibilité.

C'est fou quand même : en pratique, les temps de chargement via CDN sont plus importants que sans CDN.

"Blaze's cloud-based service automatically optimizes the code on a web page during the delivery process to ensure faster transmission of content and a faster rendering of the page, whether served to a PC, tablet or smartphone."

"10 jQuery versions loaded from Google's "

La BDD est téléchargeable à l'adresse : http://httparchive.org/downloads.php. Il est possible de faire ses propres requêtes. Les données sont stockés depuis 2010. L'échantillon regroupe 70 000 urls différentes (principalement US).

Imgmin applies established best practices and statistical means toautomatically optimize JPEG filesize for each unique image without sacrificing quality, resulting in significant site-wide latency reduction and bandwidth savings which improves user experience and saves money.

1. Est-ce automatisable ? 2. Le gain est t'il réellement intéressant ?

1. oui, de la même manière que imgmin arrive à automatiser la recherche du meilleur taux de compression global... 2. oui également, c'est la technique utilisée par http://www.jpegmini.com, juge par toi-même.

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%.

We've come quite a long way since introducing RUM about a year ago. Being the first app performance company to build real user monitoring as a core, native feature of application performance management, we are currently monitoring about 750 million page views a day, 5 billion a week and 20 billion a month for 20,000 active accounts.

"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."

A month ago, we wrote about how the Home Depot improved their web performance through a major "Perflift". Today, we want to congratulate "l'equipe" at Le Monde for improving their website. While The New York Times is the number one newspaper in US, Le Monde is the number one news source in France and for French speakers around the world.