performance.now() 2025
2025-10-30..2025-10-31
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 developers, performance engineers, web platform engineers, React developers, accessibility engineers, devtools engineers, engineering managers
topics
compilation strategies for web; performance budgets and thresholds; accessibility and load performance; cross-browser virtual scrolling; energy-aware web performance; performance CI and workflows; making performance allies (stakeholder work); interaction and navigation metrics; React rendering optimization; devtools with AI insights; fine-grained rendering and reactivity; web performance standards and spec work
| title | author | length |
|---|---|---|
| compilation | 01m | |
A short conference aftermovie that contains no technical claims, benchmarks, code or demos — just crowd shots and set music. The uploader labels it aftermovie… | ||
| How Fast is Fast Enough? | Tammy Everts | 26m |
Shows concrete tests and numbers: A multivariate throttling experiment produces fewer conversions and a throttled cohort returns less even after speed… | ||
| How to Think like a Performance Engineer | Harry Roberts | 50m |
Starts with concrete tooling and numbers: use the Chrome User Experience Report and Treyo to learn that real users hit ~3.2s P75 where Lighthouse sometimes… | ||
| Accessibility and Performance | Marcy Sutton Todd | 49m |
Claims that accessibility boosts perceived responsiveness and concrete techniques to prove it get covered: measure seconds until a screen reader reads content… | ||
| Cross-browser Virtual Scrolling | Michael Hladky | 51m |
Claims that CSS content-visibility:auto and selective contain:layout/contain:paint cut layout and paint work dramatically, often to near zero for offscreen… | ||
| Fast, Green, Responsive | Ines Akrap | 51m |
Claims that web performance and sustainability align get concrete here: W3C publishes a draft of 93 guidelines, 300 pages (about 100 contributors) that add… | ||
| Modern Performance Workflows | Umar Hansa | 47m |
Concrete demos of new DevTools plus automation: live use of individual request throttling and annotations, the recorder panel producing replayable scripts, and… | ||
| Making Performance Allies | Ethan Gardner | 44m |
Shows a concrete claim: reframing speed as a revenue and competitive metric wins allies. Uses Lighthouse scores, wpostats and web.dev case studies, analytics… | ||
| Stubborn Empathy | Tim Kadlec | 27m |
Argues that web performance needs stubborn empathy not slogans and lists concrete shifts: Core Web Vitals are going cross‑browser, showing P75 INP ~88ms Chrome… | ||
| LoAF | Andy Davies | 45m |
LoAF (Long Animation Frames) gives per-frame timings plus script-level attribution so pages can show which scripts actually cause slow frames and how often… | ||
| Measuring Interactions and Navigations | Michal Mocny | 43m |
New Performance APIs expose measurable soft navigation entry timestamps and a stream of interaction contentful paint entries so same-document navigations get… | ||
| React, Rendering, Performance | Nadia Makarevich | 47m |
Built one app three ways and measured real numbers: CSR: ~4s to first visible, +600ms sidebar, +400ms messages, SSR: server HTML shows immediately but creates… | ||
| Speculations about Web Performance | Barry Pollard | 46m |
Speculation Rules API lets sites ship a JSON rule set to prefetch or pre-render likely navigations; real deployments (WordPress, Shopify, Etsy) show measurable… | ||
| Devtools, AI, Insights | Vinicius Dallacqua | 52m |
A Performance AI assistant runs on a fork of Chrome DevTools that parses trace files, teaches LLMs specific telemetry semantics, and wires specialized agents… | ||
| Fine-grained everything | Rich Harris | 43m |
Claims that rendering is essentially solved by signal-based fine-grained reactivity but the real bottleneck is data: server payloads scale with page size not… | ||
| nothing matches | ||