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Summary: We further explore the results of upgrading to a faster server. Overall the site showed improved response speed and website "stickiness." Average page load times improved by 48% to 60% server response times improved by more than 60%, and people stayed longer, viewed more pages, and bounced less.

Perform JPEGmini processing locally on your hosts. The server software is supported for all major versions of Linux, and is optimized for high-performance, utilizing multiple cores in parallel to process millions of multi-megapixel photos per month on a single CPU.

"At Artsy we've been building Node.js applications that share code and rendering between the server and browser. We've seen many benefits from this - pages load faster, we can optimize SEO, developers are more productive, and JavaScript coding is just an overall better experience."

"Compuware APM Deep Transaction Management for PHP is the first solution in the market that combines User Experience Management (UEM), web server visibility, PHP deep-dive analysis, database access and external-call visibility all into one single solution, along with built-in performance analytics. It cuts through the complexity to provide full application visibility from a browser-click to the database and back, for all transactions, in real time 24x7. Compared to other PHP monitoring tools, Compuware APM's unique smart auto-detection of PHP pages makes it a snap to understand which page is causing what performance issues."

"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. "

"Simplify.js is a tiny high-performance JavaScript 2D/3D polyline simplification library by Vladimir Agafonkin, extracted from Leaflet, a JS interactive maps library of the same author. It uses a combination of Douglas-Peucker and Radial Distance algorithms. Works both on browser and server platforms."

mod_pagespeed is an open-source Apache module that automatically optimizes web pages and resources on them. It does this by rewriting the resources using filters that implement web performance best practices. Webmasters and web developers can use mod_pagespeed to improve the performance of their web pages when serving content with the Apache HTTP Server.

Traditional Yahoo! web servers serve compressed content to only 'good' browsers, and always with "Cache-Control: private". Newer Yahoo! web servers serve compressed content if the incoming request asks for it. No check is performed on the UA.

page prefetching, the only servers contacted are your computer's DNS servers. Firefox 3.5 support is not planned, because Firefox 3.5 includes built-in DNS prefetching that is enabled by default. More info is available at the Mozilla Developer Center: https://developer.mozilla.org/En/Controlling_DNS_prefetching

"The plan is simple... - Build a beautiful UI on top of the open source powerhouse that is WebPagetest. - Run everything in the cloud so you don't have to deal with software, servers and terabytes of tests. - Champion web performance benchmarking against competitors and industry categories. - De-geek front-end web performance techniques and bring them to a wider design and developer community who care about crafting their code."

Je viens de tester le service. L'interface est agréable.. La procédure pour renseigner son site et "celle de ces concurrents" est un un peu longue. Parcontre le temps de génération des résultats est vraiment très longues. L'interface web ne présente pas l'avancée.

Retrouvez une sélection de liens sur le thème des performances Web de la semaine passée. Au sommaire, 13 liens sur : du fast food ou un menu hamburger en 60 fps, http2 et server push, webp et jpeg, cache et max-age, un résumé de la situation des webperfs, …

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.

A free tutorial to SQL indexing and SQL tuning for developers: It avoids unnecessary details about database internals.

petite remarque sur le partage de liens : il y a quantités de langages server-side et quantités de ressources disponibles facilement pour chacun de ces langages je ne suis pas sur que ça vaille le coup de mettre des astuces de perfs de ces langages sur cette liste ?

+1 La performance front est déjà un vaste sujet, bientôt 1000 liens partagés dans ce groupe d'ailleurs :)

Ok .. Ce qui pourrait donner : web-front-performance & web-back-performance ?

Proposition pour embarquer l'alpha dans un fichier JPEG

j'espère que ça restera vraiment une "expérience", utiliser canvas, javascript, css pour afficher une image transparente, avec ces inconvénients : # By default, the images load without their alpha, then get alpha'd causing a flash. This can be worked around by making them invisible until correctly loaded. # The image must reside on the same server as the web page or the cross site scripting prohibitions in AJAX will come into play. # My examples are double loading the image, for some reason the AJAX fetch is not using the cache. I don't know why, but it is probably just me. ça reste un affreux bricolage qui pourrait donner des envies à des gens qui n'y connaissent rien et pourrir des sites avec ça. Mais l'expérience est "amusante" de là à en faire une "proposition", j'ai des doutes

C'est clair qu'afficher l'alpha avec canvas+js reste du bricolage. En revanche, si les implémenteurs arrivent à se mettre d'accord pour le faire directement dans le navigateur, ça pourrait être intéressant.