the web performance conference27-28 October 2022, Amsterdam

Talks and 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 Harry Roberts, Tammy Everts and Tim Kadlec.

Below is our line-up. We will add more speakers as time progresses.

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Harry Roberts

Consultant Web Performance Engineer, @csswizardry

With a client list including Google, Unilever, and the United Nations, Harry is an award-winning Consultant Front-end Architect who helps organisations and teams across the globe to plan, build, and maintain product-scale UIs.

A Google Developer Expert, he writes on the subjects of CSS architecture, performance, and scalability at, develops and maintains inuitcss, authored CSS Guidelines, and Tweets at @csswizardry.

Session topic: The <head> tag

Dora Militaru

Developer Relations Engineer, Fastly, @doramilitaru

Dora is a Developer Relations Engineer at Fastly. She cut her developer teeth on building a global news website, and cultivated her compassion by leading data protection and site reliability engineering teams. Working at a tiny kitchen table in London, she dreams of helping others build a faster, more secure, more reliable – a better web – for everyone.

Session topic: Performance Culture

Andy Davies

Web Performance Consultant, SpeedCurve, @AndyDavies

Andy is a Web Performance Consultant at SpeedCurve, where he helps customers to measure and improve the speed of their sites.

He stumbled into web performance in 2008 while launching an online education service and quickly ran into the challenge of delivering rich content to schools over congested networks.

Since 2012 he's focused on web performance full time and has worked with a wide variety of organisations from retailers and publishers to financial services and FMCG brands.

Session topic: Third-party scripts

Léonie Watson

Director, TetraLogical, @LeonieWatson

Léonie is Director of TetraLogical; a member of the W3C Advisory Board; co-Chair of the W3C Web Applications Working Group; and until recently was a member of the Accelerated Mobile Pages (AMP) Advisory Committee.

Amongst other things, Léonie is co-organiser of the Inclusive Design 24 (#id24) conference; co-author of the Inclusive Design Principles; and mentor to young people interested in the fields of accessibility and inclusive design. She is also a Microsoft Most Valued Professional (MVP).

Léonie is often found at conferences, talking about web standards, accessibility mechanics, and pushing the boundaries of inclusive design (with existing technologies like SVG, HTML, ARIA, and JavaScript, as well as new technologies like AI and WebVR). She has also written about these things for Smashing magazine,, and Net magazine, as well as on her own site Tink.UK.

In her spare time, Léonie likes reading, cooking, drinking tequila, and dancing (although not necessarily in that order)!

Session topic: Accessibility == Performance

Stoyan Stefanov

Software Engineer, WebPageTest by Catchpoint, @stoyanstefanov

Stoyan has recently joined WebPageTest by Catchpoint as a software engineer (formerly at Facebook and Yahoo!). He has a storied history as an accomplished author, contributor, and custodian of the well-known and respected Planet Performance calendar. He habitually speaks about web development topics at conferences and on his blog at Stoyan is also the creator of the image optimization tool, YUI contributor and was the architect of Yahoo's performance optimization tool YSlow 2.0.

Session topic: Micro Benchmarks

Nic Jansma

Software Developer, Akamai, @nicj

Nic is a software developer at Akamai building high-performance websites, apps and open-source tools.

Session topic: Modern Metrics

Princiya Sequeira

Engineering Manager, Anaconda, @princi_ya

Princiya has a dozen years of experience building full-stack web & mobile apps, implementing CI/CD solutions, supporting infrastructures, and leading technical teams at scale.

She maintains Lightbeam, a browser extension to visualise first and third-party trackers.

When not coding or cooking, Princiya advocates for open source, privacy & security and offers career advice for underrepresented folks in technology.

Session topic: Web Vitals & SEO

Sharell Bryant

Engineering Manager, Teachers Pay Teachers, @shrell

Sharell is an engineering manager at Teachers Pay Teachers, an online platform with a mission of empowering educators to teach at their best. Sharell leads teams that are focused on constantly improving developer experience and enabling high-quality and high-velocity product development. She lives in New York City where she also enjoys creative coding and playing music.

Session topic: Continuous Learning

Sia Karamalegos

Web Performance Engineer, Shopify, @TheGreenGreek

Sia is a web developer and performance engineer, currently working on web performance at Shopify. She's also an international conference speaker, writer, Google Developer Expert in Web Technologies, Cloudinary Media Developer Expert, and Stripe Community Expert. She co-organizes the Eleventy Meetup which won the 2021 Jammies Award for Outstanding Community Meetup.

Early Learnings for Early Hints at Shopify

103 Early Hints allow us to preconnect and even preload resources before the main document arrives. Come learn how the partnership between Shopify, Google, and Cloudflare led to this performance breakthrough, how Shopify is continuing to experiment with it at scale, and thoughts on what the future holds.

Nolan Lawson

Web Developer, Salesforce,

Nolan is a web developer focused on client-side performance. He has worked on the browser performance team for Microsoft Edge, and currently works on the Lightning Web Components framework at Salesforce. He blogs about performance and other topics at

CSS runtime performance

On the client side, we pay a lot of attention to JavaScript performance. But relatively little time is spent on CSS, even though style and layout calculation can impact runtime performance as well. In this talk, I'd like to demystify some aspects of CSS runtime performance, exploring what parts the browser has already optimized, and what we as web developers can do to speed up styling.

The venue

Zuiderkerkhof 72
1011 WB Amsterdam
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The venue is wheelchair-accessible