the web performance conference21-22 November 2019, Amsterdam

Speakers is a single track conference with fourteen world-class speakers, covering today’s most important web performance insights. They are selected by our program co-chairs Tammy Everts and Tim Kadlec.

Below you'll find our line-up so far. All sessions are geared toward delivering takeaway action items for teams creating fast web experiences across all devices.

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The conference will run from 09:00 sharp to roughly 18:30 on both days, with drinks at the venue afterwards.

Annie Sullivan

Software Engineer, Google, @anniesullie

Annie is a software engineer with Google. She is passionate about building a better performing web for users across the globe. Her tenure as a Googler spans 14 years, with experience on the toolbar, docs, web search, and chrome teams. Annie most recently comes from a tour-of-duty with the United States Digital Service, a tech startup at the White House, where she contributed to projects at the Department of Energy. She lives in Michigan with her husband Doug and two sons. See her laser engraved art at

Session topic: To be announced

Emily Nakashima

Engineering Manager, Honeycomb, @eanakashima

Emily manages the engineering & design teams at In the past, she's worked on javascript, web perf optimization and client-side monitoring & telemetry at other developer tools companies like Bugsnag & GitHub. In her free time, she organizes an unconference called AndConf, makes many checklists, and likes to talk about disaster preparedness.

Session topic: Observability and user happiness

Tim Kadlec

Performance Consultant, @tkadlec

Tim is a performance consultant and trainer focused on building a web everyone can use. He is the author of High Performance Images (O'Reilly, 2016) and Implementing Responsive Design: Building sites for an anywhere, everywhere web (New Riders, 2012), and was a contributing author for Smashing Book #4: New Perspectives on Web Design (Smashing Magazine, 2013), and the Web Performance Daybook Volume 2 (O'Reilly, 2012). He writes about all things web at You can find him sharing his thoughts in a briefer format on Twitter at @tkadlec.

Session topic: Performance Budgets

Stuart McMillan

Head of Ecommerce, Schuh, @mcmillanstu

Stuart first started in ecommerce 17 years ago, selling tents and other outdoor equipment, before properly getting his geek on and moving in to a senior development role. Moving back in to a more general role, he has worked for Schuh for seven years; his job description includes responsibility for site performance, analytics and the quality of the conversion across all devices and being the champion for the multichannel, connected customer. He’s big advocate of web standards and appreciates a job well done. He brings a detailed technical appreciation to the Schuh ecommerce department, combined with a truly awful sense of humour. His aim is to help the ecommerce team to create the definitive ecommerce experience in the UK footwear sector.

Session topic: Case study

Kyle Rush

VP of Engineering, Casper, @kylerush

Kyle is the VP of Engineering at Casper where he leads a software engineering team that delivers better sleep products to consumers. Prior to joining Casper he was the Deputy CTO at Hillary for America building digital products that engaged over 1 million grassroots volunteers across the country and raised over $330 million in online donations. He frequently speaks on topics related to web technology and conversion rate optimization. His work has been showcased at Velocity Conference, MozCon, and in A/B Testing: The Most Powerful Way to Turn Clicks Into Customers. Prior to joining Hillary for America, Rush was the Head of Optimization at Optimizely and Director of Technology at the New Yorker. At the New Yorker he worked with a small team on the introduction of a site redesign and incorporation of a metered paywall. Previously, he served as the Deputy Director of Frontend Web Development at Obama for America 2012, where he managed the technical and product aspects of online fundraising totaling $690 million in 20 months.

Session topic: Case study

Henri Helvetica

Freelance Developer, @HenriHelvetica

Henri is a freelance developer who has turned his interests to a passionate mix of site performance engineering and pinches of user experience. When not reading the deluge of daily research docs and case studies, or indiscriminately auditing sites in devtools, Henri can be found contributing back to the community: Toronto Web Performance Group meetup + SPOTLIGHT: PERFORMANCE conference co-organizer, curating performance content for conferences or volunteering his time for lunch and learns at various bootcamps. Additionally, you can find him speaking at conferences, and touching base with the community—all with a radiant smile. Otherwise, he’s focusing on running the fastest 5k possible (surprise surprise).

Session topic: Present of Performance

Patrick Hamann

Principal Software Engineer, Fastly, @patrickhamann

Patrick is a Principal Software Engineer at Fastly where—among other things—he is helping to build a faster web for all. Prior to Fastly, he helped architect some of the world’s largest media websites including The Guardian and the Financial Times. When not speaking or ranting about performance, he enjoys spending his spare time discovering new food and craft beer.

Session topic: Performance patterns for difficult situations

Tatiana Mac

Independent Designer, @TatianaTMac

Tatiana is an independent American designer who works directly with organisations to build clear and coherent products and design systems. She believes the trifecta of performance, accessibility, and inclusion can work symbiotically to improve our social landscape digitally and physically. When ethically-minded, she thinks technologists can dismantle exclusionary systems in favor of community-focused, inclusive ones. Never totally pleased with design tools, she designs in browser to visual narratives into the web in a semantic and component-orientated way. Her current obsessions are optimising variable fonts, converting raster images into to SVGs, and recreating modernist paintings in CSS grid. When she can successfully escape vim, she finds new countries to explore (33 and counting).

Session topic: How Privilege Defines Performance

Patrick Meenan

Web Performance Engineer, Facebook, @patmeenan

Patrick has been working on web performance in one form or another for the last 20 years and is currently working on web performance at Facebook. Prior to that he worked at Cloudflare and Google to make Chrome and the web faster. Patrick created the popular open source WebPageTest web performance measurement tool and runs the free instance of it at

Session topic: HTTP/2 priorities

Divya Sasidharan

Developer Experience Engineer, Netlify, @shortdiv

Divya is a web developer who is passionate about open source and the web. She is currently a developer experience engineer at Netlify, and believes that there is a better workflow for building and deploying sites that doesn’t require a server—ask her about the JAMstack. You will most likely find her in the sunniest spot in the room with a cup of tea in hand.

Session topic: Predictive Prefetching

Some of the most cutting edge and effective web performance optimizations, like prefetch and preconnect, involve being proactive. We make predictions to determine where a user is likely to go next and load resources ahead of time so page load is as fast as possible. This is where machine learning comes in handy. By training a machine learning model (maybe a markov chain?) with current analytics data, we can take the guess work our of our predictions and more accurately load resources ahead of time. In this talk, we will examine techniques currently being developed, like GuessJS to make predictive prefetching a reality.

Simon Hearne

Web Performance Solutions Engineer, Akamai, @simonhearne

Simon is passionate about web performance. He has been working in the industry since 2012 in roles as diverse as professional services, software engineering and solutions engineering. His current role is to help his clients achieve excellent user experiences through monitoring, testing and managing web performance.

Session topic: Deep dive into third-party performance

Vitaly Friedman

Editor-in-chief, Smashing Magazine, @smashingmag

Vitaly loves beautiful content and does not give up easily. From Minsk in Belarus, he studied computer science and mathematics in Germany, discovered the passage a passion for typography, writing and design. After working as a freelance designer and developer for 6 years, he co-founded Smashing Magazine, a leading online magazine dedicated to design and web development. Vitaly is the author, co-author and editor of all Smashing books. He currently works as editor-in-chief of Smashing Magazine in the lovely city of Vilnius, Lithuania.

Session topic: Future of Performance

Ilya Grigorik

Web Performance Engineer, Google, @igrigorik

Ilya is a web performance engineer at Google, co-chair of the W3C Web Performance Working group, and author of High Performance Browser Networking (O'Reilly) book.

Session topic:​.fail(...)

Tammy Everts

Chief Experience Officer, SpeedCurve, @tameverts

Tammy is chief experience officer at SpeedCurve, where she helps companies understand how visitors use their websites, and a cochair of O’Reilly Fluent. Tammy has spent the past two decades studying how people use the web. Since 2009, she’s focused on the intersection between web performance, user experience, and business metrics. Her book, Time Is Money: The Business Value of Web Performance from O’Reilly, is a distillation of much of this research. She also cocurates (with Tim Kadlec) WPO Stats, a collection of performance case studies.

Session topic: Performance Culture