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Tim Vereecke (@TimVereecke) loves speeding up websites and likes to understand the technical and business aspects of WebPerf since 15+ years. He is a web performance architect at Akamai and also runs scalemates.com: the largest (and fastest) scale modeling website on the planet. Delivering cached HTML pages to recently logged in (=RLI) visitors is unfortunately a guarantee to frustrate users! On w
Stoyan (@stoyanstefanov) is a former Facebook and Yahoo! engineer, writer ("JavaScript Patterns", "React: Up and Running"), speaker (JSConf, Velocity, Fronteers), toolmaker (Smush.it, YSlow 2.0) and a guitar hero wannabe. Problem As the previous post puts it: A slow CSS prevents the JavaScript following it from executing. And in addition, when the JS following the CSS is inline, it’s naturally syn
Robin Marx is a Web Performance Architect at Akamai Technologies. His main expertise is in network protocol performance, including HTTP/3 and QUIC, which was the topic of his PhD research. In a previous life he was a multiplayer game programmer and co-founder of LuGus Studios. YouTube videos of Robin are either humoristic technical talks or him hitting other people with longswords. If you deal wit
Alex Hamer is software engineer at Tesco, with a passion for building high performance, accessible web applications for the many. For a dynamic web application Time To First Byte (TTFB) can take time, this is certainly the case with the applications I work with. For each request the server receives, in order to respond correctly it could be performing a number of things that can add up; multiple A
How do you take a popular developer platform, free and maybe even open source, and build a strong business around it? Wait a minute, did she just say ‘developer’, ‘open source’ AND ‘business’ in the same sentence? I must warn you – this article is not about web performance insights or web development, but rather […] Largest Contentful Paint (LCP) is a performance metric representing the user exper
Nic Jansma (@nicj) is a software developer at Akamai building high-performance websites, apps and open-source tools. Table of Contents The JS Self-Profiling API What is Sampled Profiling? Downsides to Sampled Profiling API Document Policy API Shape Sample Interval Buffer Who to Profile When to Profile Specific Operations User Interactions Page Load Overhead Anatomy of a Profile Beaconing Size Comp
Stoyan Stefanov (@stoyanstefanov) is an ex-Facebook and Yahoo! engineer, writer ("JavaScript Patterns", "React: Up and Running"), speaker (JSConf, Velocity, Fronteers), toolmaker (Smush.it, YSlow 2.0) and a guitar hero wannabe. Happy 25th birthday CSS! Yes, today marks 25th year of CSS’ existence. Source. Contrary to what some may have you believe, CSS is not the worst. CSS is lovely, CSS is empow
Nic Jansma (@nicj) is a software developer at Akamai building high-performance websites, apps and open-source tools. Table of Contents Introduction What are Beacons? Beaconing Stages Sending Data at Startup Gathering Data through the Page Load Incrementally Gathering Telemetry throughout a Page’s Lifetime Gathering Data up to the End of the Page “Whenever” How Many Beacons? A Single Beacon Multipl
Anthony Ricaud (@anthony_ricaud) is a web engineer helping teams ship efficient products at a sustainable pace. With a broad understanding of web protocols and browsers, he likes to design simple but fast web architectures. Longer page load times Page is unusable until the JavaScript loads and if it does so without any errors Usability, reactivity and accessibility can be lacking without a team wi
Peter Hedenskog (@soulislove) loves Open Source and really cares about the open web. Peter is one of the creators of the Open Source sitespeed.io web performance tools. I hope you didn’t miss the session about The Future Of Core Web Vitals at Chrome Dev Summit 2020. I think it’s great that the Chrome team is open about the metrics and is looking for feedback! When Google Web Vitals first was intro
Gilles Dubuc (@MonsieurPerf) is the engineering manager of the Performance Team at the Wikimedia Foundation. The web performance community has many industry stories about performance perception. But they almost never publish the underlying data and can’t be peer reviewed. As readers, we have to assume that experiments were set up correctly and that the data was interpreted appropriately to reach t
Table of Contents Introduction What are Beacons? Beaconing Stages Sending Data at Startup Gathering Data through the Page Load Incrementally Gathering Telemetry throughout a Page’s Lifetime Gathering Data up to the End of the Page “Whenever” How Many Beacons? A Single Beacon Multiple Beacons Mechanisms Image XMLHttpRequest sendBeacon() Fetch API Fallback Strategies Payload Limits URL […] More and
Robin Marx is a Web Performance and network protocol researcher at Hasselt University, Belgium. He is mainly looking into HTTP/3 and QUIC performance, and develops the qlog and qvis tools to make this easier. In a previous life he was a multiplayer game programmer and co-founder of LuGus Studios. YouTube videos of Robin are either humoristic technical talks or him hitting other people with longswo
Matt Hobbs (@TheRealNooshu) is Head of Frontend Development at the Government Digital Service. An experienced frontend developer, he is passionate about using his skills to build accessible and performant user interfaces. Matt makes a point of keeping on top of the latest technology and tools, is interested in all aspects of interface development, and is a keen advocate for best practices. In this
Alessandro Ghedini is a Systems Engineer at Cloudflare helping standardize, implement and deploy network protocols for the Internet. QUIC, the new Internet transport protocol designed to accelerate HTTP traffic, is delivered on top of UDP datagrams, to ease deployment and avoid interference from network appliances that drop packets from unknown protocols. This also allows QUIC implementations to l
Lyubomir Angelov (@angelovcode) is a Web Performance enthusiast working as Development Team Leader at Isobar Commerce. Contributing to the web since 2007 he went through hundreds of platforms and solutions. He is passionate to work with people to build great platforms. Perfectionist, sports man and tries to learn lock picking. This case study shows one way to implement partial Server-Side Renderin
Aggelos Arvanitakis (@AggArvanitakis) is a front-end dev that likes huskies and is afraid of bees. Interested in all things perf... CSS-in-JS is becoming a popular choice for any new front-end app out there, due to the fact that it offers a better API for developers to work with. Don’t get me wrong, I love CSS, but creating a proper CSS architecture is not an easy task. Unfortunately though, besid
Matt Hobbs (@TheRealNooshu) is Head of Frontend Development at the Government Digital Service (GDS), a unit of the Government of the United Kingdom's Cabinet Office tasked with transforming the provision of online public services. An experienced frontend developer, he is passionate about using his skills to build accessible and performant user interfaces. He makes a point of keeping on top of the
Michael Gooding (@Michael_G_81) is a performance Geek at Akamai, working with customers, staff and basically anyone that will listen. A premature grumpy old man, slow websites just add to the grumpiness and grey hairs. Read any performance blog or attend any performance talk and everyone will advise you that optimising images is the best place to start (insert the ever present low hanging fruit ph
Stoyan (@stoyanstefanov) is a Facebook engineer, former Yahoo!, writer ("JavaScript Patterns", "React: Up and Running"), speaker (JSConf, Velocity, Fronteers), toolmaker (Smush.it, YSlow 2.0) and a guitar hero wannabe. Let’s talk a bit about keeping tabs on how much CPU is consumed by an application’s JavaScript. And let’s frame the discussion around components – the atomic building blocks of the
I didn’t have anything planned for the Web Performance Calendar this year. That all changed after I read Tim Vereecke’s interesting proposal about a “Frustration Indexâ€� on Day 17. His post got my attention, as a performance analyst, because some things looked familiar to me, while other things confused me. Eventually, it all became a […]
Tobias Baldauf (@tbaldauf) helps to keep trivago fast. He creates DevOps tools, image optimization algorithms & speaks at conferences. He's a proud dad, mindful veggy & music lover. Find out more at who.tobias.is tl;dr: JPEG-XR, an image format supported on Internet Explorer and Microsoft Edge browser, gets software-decoded on the CPU main thread alongside Javascript and thereby negatively impacts
Jakub Gieryluk (@__jakub_g) is a web & mobile applications developer, currently working at Dailymotion's video player team, focusing on front-end performance aspects. There are many very good articles out there on how to use new feature X or technique Y or tool Z to improve the performance of your websites. Navigating the labyrinth of modern web performance might be hard though if you’re new to th
Those roundtrips cost time. On a super fast fiber connection it might take just 10 ms for a round trip but on a slow G3 connection that will be easily a small 3 digit number. And those poor clients in Australia who use US servers have to wait a lot. And as I always tell my clients: Bandwidth is not that important for a normal webpage. Latency between the client and the server is. In December 2018
The results basically confirmed my hypothesis, 55% SVG, and PNG + GIF brings the percentage of these three file types to 93%. What did surprise me was that the remaining 7% are nearly all fonts. What are the tonnage costs of these files? We can calculate the length of each of these files (this is uncompressed, and in bytes), and graph the percentiles: Looking carefully at this chart, there are 3 l
Katie Hempenius (@katiehempenius) is an engineer at Google where she works on web performance. Prefetching is a technique that can be used to achieve near-instant page loads. This technique has been used for decades to speed up hardware and compilers; but it’s only been recently, thanks to the introduction of the Network Information API, that it’s usage to speed up web applications has become prac
Robin Marx is a Web Performance PhD candidate at Hasselt University, Belgium. He is mainly looking into HTTP/2 and QUIC performance, and maintains the TypeScript QUIC implementation Quicker. In a previous life he was a multiplayer game programmer and co-founder of LuGus Studios. YouTube videos of Robin are either humoristic technical talks or him hitting other people with longswords. QUIC and HTTP
We are talking a lot about performance, how it can be improved, which tools to use for performance improvements but less about how to keep reached performance on a proper level. So, let’s take a look at tools which can help you to do so. Size Limit ai/size-limit Size Limit is a tool to prevent JavaScript libraries bloat. With it, you know exactly for how many kilobytes your JS library increases th
Addy Osmani (@addyosmani) is an Engineering Manager working with the Chrome and Web Developer Relations teams at Google. He's written open-source books like 'Learning JavaScript Design Patterns' and 'Essential Image Optimization' and created open-source projects like Yeoman, HNPWA and Critical. You can find more of his work on web performance over on his Medium channel. Tinder recently swiped righ
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