RLI (Recently Logged-In) Browser Cache Bypassing
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
Fastest Way of Passing State to JavaScript, Re-visited
Jacob Groß (@kurtextrem@webperf.social, @kurtextrem) is a passionate Software Engineer who loves all topics related to webperf, UX & security. Currently Principal Software Engineer at JSMD Group, based in Munich, Germany. Server-rendered Redux apps commonly have to transfer the store state from the server to the client. Transferring large states can be slow, so in 2019, Henrik Joretag benchmarked
Simplifying Web Performance with a single UX score
Sander van Surksum (@SSurksum) is a Web Performance Consultant, with 20+ years in tech, founded Iron/Out, dedicated to speeding up websites. He's passionate about improving online user experiences. At the recent PerfNow conference, Tammy Everts highlighted a major challenge in web performance: the excess of different metrics. This issue becomes clear when considering a scenario like a retail compa
Benchmarking, Profiling, and Optimizing JavaScript libraries
Introduction I wish to bring you with me on a journey to learn about optimizing a library for localization, I would like to share my learnings with you on benchmarking, profiling, and optimizing. At Swissquote Bank, we use client-composed micro-frontends, and our platforms are usually available in at least 8 languages. To support this requirement, we had to build a translation/localization library
The RUM Archive and Benford's Law
Amit Singh (@sans_colon) is a Senior Data Scientist at Akamai Technologies. He works on the mPulse team analyzing web performance data. The Akamai mPulse team studies Real User Monitoring (RUM) data to help our customers understand how to optimize website performance and how user behavior may be altered by changes to configurations or resource requests on their site. As a data scientist on the mPu
HTTP/3 Prioritization Demystified
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
103 Early Hints
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
JS Self-Profiling API In Practice
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
CSS me not
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
Request for a General Theory of Web Performance
Tanner Hodges (@atannerhodges) is a web developer at Red Ventures, trying to help people understand complex things in simple ways. We’re at another inflection point in Web history. Web3 is all the rage, as is privacy, security, AR/VR, edge computing, quantum computing, 5G, Internet of Things, and beyond. More browsers are converging, new features are coming out every day, and everyday developers a
From fonts to SVG: an icon migration strategy
Erwin Hofman (@blue2blond) started building his own CMS in 2004, which is now used by several Dutch web agencies. The CMS also became his playground to eventually help e-commerce agencies adopting and improving (perceived) performance, Core Web Vitals and accessibility. A lot, maybe even too much has been written about icon loading strategies already. CSS-tricks.com already had a great (inline) SV
Strategies for Telemetry Exfiltration (aka Beaconing In Practice)
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
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The Golden Rule of Web Performance and Different Performance Engineering Specializations
Digging through Chrome traces: an introduction with an example
Measuring, monitoring and optimizing TTFB with Server timing
LCP(FE)
Web Performance APIs Appreciation Post
Mobile Performance of Next.js Sites
HTTP compression
Learnings from setting up a performance device lab