performance.now() 2019
2019-11-21..2019-11-22
Amsterdam, Netherlands
[performance.now() 2018, performance.now() 2019, performance.now() 2022, performance.now() 2023, performance.now() 2024, performance.now() 2025]
who it's for
frontend engineers, web performance engineers, site reliability engineers, engineering managers, DevOps engineers, UX engineers
topics
Lighthouse and audit metrics; performance budgets and SLOs; WebAssembly compilation tooling; HTTP/2 prioritization failures; predictive prefetching implementations; third-party script dependency mapping; JavaScript bundle size reduction; observability and tracing for UX; Largest Contentful Paint measurement; compression and CDN strategies
| title | author | length |
|---|---|---|
| performance.now() 2019 compilation | 01m | |
On Nov 21 & 22, 2019, the 2nd performance.now() conference took place in Amsterdam; a single-track conference with 14 speakers, covering today’s most important… | ||
| A Decade of Disciplined Delivery | Henri Helvetica | 41m |
Retrospective testing of Steve Souders’ 14 rules names concrete claims, tools and outcomes: YSlow and Lighthouse audits show a median of about 69 requests on… | ||
| The 7 Habits of Highly Effective Performance Teams | Tammy Everts | 44m |
Company interviews plus case studies claim that performance culture drives measurable business wins: Shopzilla cuts load to 1.2s and sees ~12% conversion lift… | ||
| WebAssembly – To the browser and beyond! | Patrick Hamann | 53m |
WebAssembly is a binary compilation target that decodes up to 20x faster than JavaScript and already ships in ~88.39% of browsers; examples include a Rust… | ||
| How Privilege Defines Performance | Tatiana Mac | 50m |
Argument: definitions of "performance" mirror the builder's privilege and miss real users. Evidence: Majestic Million/WCAG lists common accessibility fails… | ||
| Observability is for User Happiness | Emily Nakashima | 45m |
Makes the concrete claim that observability must measure user happiness not server nines and shows how Honeycomb instruments a React web app with tracing… | ||
| performance.now().reject(reasons) | Ilya Grigorik | Ilya Grigorik | 43m |
Claim: adoption fails from incentives and friction, not lack of knobs. Evidence: Web Almanac shows p75 image savings 1.5s, p90 over 5s; BlinkOn counts ~30% of… | ||
| From Milliseconds to Millions: The Numbers Driving Web Perf | Harry Roberts | 49m |
Slides and numbers drive decisions: concrete wins, not vague topics. Case studies show measurable impact — 6.2–6.4 seconds faster on mobile without touching ad… | ||
| HTTP/2 priorities | Patrick Meenan | 51m |
Shows actual failures and fixes: a Cloudflare proxy change initially breaks prioritization then is fixed; a WebPageTest prioritization test (use 3G fast and… | ||
| Predictive Prefetching | Divya Sasidharan | 44m |
Concrete claim: predictive prefetching uses Google Analytics navigation data to build a probability matrix and inject prefetch links at build time and via… | ||
| When JavaScript Bytes | Tim Kadlec | 51m |
JavaScript is byte‑for‑byte the costliest resource: median mobile sites send ~378 KB compressed (≈1.8 MB on‑device), Chrome data shows 1.7 MB AGC vs 1.8 MB… | ||
| Deep dive into third-party performance | Simon Hearne | 46m |
HTTP Archive queries, browser devtools and RUM data show the median site has 37% third‑party requests, p50 reveals eight sync scripts, and RequestMap… | ||
| Lessons learned from performance monitoring in Chrome | Annie Sullivan | 45m |
Covers concrete lessons: metric design favors user‑facing moments and simplicity, Chrome builds largest contentful paint from paint events and filters splash… | ||
| The Bright Future of Web Performance | Vitaly Friedman | 49m |
Conference survey anchors on measurable gaps: JavaScript transfer grows 611% since 2011 while third‑party weight jumps 706%, many low‑end phones run 12–15×… | ||
| nothing matches | ||