A Tale of Four Caches
Yoav Weiss (@yoavweiss) has been working on mobile Web performance for longer than he cares to admit. He takes image bloat on the Web as a personal insult, which is why he joined the Responsive Image Community Group and implemented the various responsive images features in Blink and WebKit. He is now working at Akamai as a Principal Architect, focused on making the Web platform faster by adding pe
2013 Archives
The rise of complex web applications and the widespread adoption of JavaScript-based server stack mean that, in some cases, the performance of some JavaScript code may affect the overall application performance. In this situation, it is imperative to analyze the performance carefully in order to come up with the right optimization strategy. There is always […] Everyone knows that third party conte
phantomas - PhantomJS based, modular web performance metrics generator
Maciej Brencz is a Software Engineer at Wikia. He specializes in Web Performance and building scalable websites, struggling to send as less bytes as possible. He spends a part of his free time on GitHub or enjoying another juicy bit of kæstur hákarl. Web performance is gaining interest in IT world since 2010. There are many tools that can help you in making and keeping your site fast. Google’s P
Measure web performance with Jenkins
Peter Hedenskog (@soulislove) works at Cybercom in Stockholm, Sweden. He likes soulful music and building tools (checkout sitespeed.io, JDBCMetrics and BrowserTime). Tobias Lidskog (@tobiaslidskog) is passionate about web performance and empowering developers with great tooling. He's located in Stockholm, and is currently working on payment solutions at Seamless. Most recently he's been contributi
Progressive jpegs: a new best practice
Bandwidth-wise, images are hogs. They are the largest average web site payload (62%), and they are most often the content bottleneck. When images arrive, they come tripping onto the page, pushing other elements around and triggering a clumsy repaint. They come “chop chop chop chop chop downâ€� or you get nothing until suddenly “boom!â€� out of nowhere there it is. We all know what I’m talking abou
Deciphering the Critical Rendering Path
Ilya Grigorik (@igrigorik) is a web performance engineer and developer advocate on the Make The Web Fast team at Google, where he spends his days and nights on making the web fast and driving adoption of performance best practices. As Steve pointed out in an earlier post, window.onload is not the best metric for measuring website speed. It is a convenient metric, and a familiar one, but it fails t
Efficient HTML5 data- attributes
Stoyan (@stoyanstefanov) is a Facebook engineer, former Yahoo!, writer ("JavaScript Patterns", "Object-Oriented JavaScript"), speaker (JSConf, Velocity, Fronteers), toolmaker (Smush.it, YSlow 2.0) and a guitar hero wannabe. HTML5 introduces custom data attributes: non-visible pieces of information associated with a DOM node. This is an extremely convenient feature, especially since these attribute
Mobile UI performance considerations
Estelle Weyl (@estellevw) started her professional life in architecture and then managed teen health programs. In 2000, Estelle took the natural step of becoming a web standardista. She currently writes for MDN Developer Network and organizes #PerfMatters Conference. She has consulted for Kodak Gallery, SurveyMonkey, Samsung, Yahoo, Visa, and Apple, among others. Estelle shares esoteric tidbits le
Lazy evaluation of CommonJS modules
Tobie Langel (@tobie) is a Software engineer at Facebook. He’s also Facebook’s W3C AC Rep. An avid open-source contributor, he’s mostly known for having co-maintained the Prototype JavaScript Framework. Tobie recently picked up blogging again and rants at blog.tobie.me. In a previous life, he was a professional jazz drummer. About two years ago, the mobile Gmail team posted an article focused on r
CSS Selector Performance has changed! (For the better)
Nicole Sullivan (@stubbornella) is an evangelist, front-end performance consultant, CSS Ninja, and author. She started the Object-Oriented CSS open source project, which answers the question: how do you scale CSS for millions of visitors or thousands of pages? She also consulted with the W3C for their beta redesign, and is the co-creator of Smush.it, an image optimization service in the cloud. Nic
How Response Times Impact Business?
The last fourteen years Alex Podelko (@apodelko) worked as a performance engineer and architect for several companies. Currently he is Consulting Member of Technical Staff at Oracle, responsible for performance testing and optimization of Hyperion products. Alex currently serves as a director for the Computer Measurement Group (CMG). He maintains a collection of performance-related links and docum
A Practical Guide to the Navigation Timing API
Buddy Brewer (@bbrewer) is a co-founder of Log Normal, a company that shows you exactly how much time real people spend waiting on your web site. He has worked on web performance issues in various roles for almost ten years. Navigation Timing is an API from the W3C’s Web Performance Working Group that exposes data about the performance of your web pages. Navigation Timing is a major new developmen
Pure CSS3 images? Hmm, maybe later
Marcel Duran is the Front End Lead for Yahoo!'s Exceptional Performance Team. He has been into web performance optimization on high traffic sites in Yahoo! Front Page and Search teams where he applied and researched web performance best practices making pages even faster. He is now dedicated to YSlow and other performance tools development, researches and evangelism. His goal is to make the web ev
2011 Archives
Wise words from Tom on approaching performance optimization projects for busy multi-tasking developers. Here’s to an optimized 2012!
Bulletproof JavaScript benchmarks
Mathias Bynens (@mathias) works as a freelance web developer in Belgium. He likes HTML, CSS, JavaScript and WPO. To help with those last two things, he created jsPerf a while ago. John-David Dalton (@jdalton): my first JavaScript project was a Super Mario Bros. game engine I made in high school. I have always been drawn to JavaScript and other ECMAScript based languages. I spend most of my time ti
Mobile performance analysis using pcapperf
Bryan McQuade (@bryanmcquade) leads the Page Speed team at Google. He has contributed to various projects that make the web faster, including Shared Dictionary Compression over HTTP and optimizing web servers to better utilize HTTP. Libo Song is a Software Engineer at Google. He is a member of the Page Speed team. Recently, he helped launch mod_pagespeed. Recently, the Page Speed team has been foc
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WebPagetest internals
Optimizing Your Network Stack for Optimal Mobile Web Performance
Beyond Bandwidth: UI Performance
Measuring the Performance of Task Completion