It sounds like a simple question, but if you've been working in performance long enough, you know the answer is far from straightforward. In this Day 1 keynote, Tammy asks questions—from neuroscience to business metrics—that get you thinking about how you create, measure, and report your performance goals.

As awareness and tooling around site speed have been improving at a very exciting rate, has performance testing actually become any easier? In this talk, we'll look at practical tools and workflows so every test has a purpose and provides actionable, reliable data.

What if performance meant more than speed — what if it included how intuitively and equitably people can interact with your website? This session takes a practical look at how designing for accessibility contributes to more responsive, usable experiences, especially for disabled users, with ways to measure beyond load speed.

CSS content-visibility is a powerful tool that bypasses unnecessary rendering for offscreen content, drastically improving load times and responsiveness. This talk demonstrates benchmarks, practical techniques for content‑rich environments, and case studies.

Performance work has always been about speed, but speed is only part of the story. This session explores why faster sites are greener sites, practical principles from the W3C Sustainable Web Guidelines, and ideas like carbon‑aware websites that adapt to grid intensity.

Covers recent browser DevTools features and how AI assistance in DevTools can speed up your debugging workflow. Learn about automated workflows using coding agents, DevTools protocol automation, MCP, and CI/CD integration to catch performance issues before production.

Web performance data often serves as a proxy for key business metrics. This talk offers practical tips on presenting engineering data as competitive advantage to build alliances and make performance optimization a strategic priority.

The Long Animation Frames (LoAF) API provides data on what Main Thread activity caused a long frame, overcoming limitations of the Long Tasks API. Learn how to use LoAF to understand and improve script performance.

LCP and INP measure loading and responsiveness, but same‑document soft navigations blur those lines. Learn about new Performance APIs to measure interactions and navigations, how they work, and what's next.

One app implemented with CSR, SSR, and RSC — then measured. Explore how each technique works, how they influence initial load, what RSC brings, and the trade‑offs.

The Speculations Rules API introduces a declarative way to prefetch and prerender future navigations. Learn the latest features, safe deployment strategies, and what's coming next.

A deep‑dive into building a Performance AI assistant and agentic workflows on top of a Chrome DevTools fork. Lessons on communicating performance data to agents, which signals matter, and turning telemetry into actionable insights.

Modern frameworks like Svelte are fast thanks to signal‑based fine‑grained reactivity, but performance is more than 60fps. This talk covers new approaches to build fast, reliable, data‑efficient apps.