Performance news — Web Standards

August 28
Making a long list fast: content-visibility vs. virtualization
Why unmounting rows costs you find-in-page, anchor links, focus, and per-card state.
August 25
Intent to ship: JPEG XL
Firefox ships the format with the Rust jxl-rs decoder, progressive rendering, and lossless wins.
August 20
Field guide to the Chrome DevTools Performance panel
An interactive walkthrough of the waterfall, flame chart, LCP, CLS, INP, and the Insights panel.
August 11
Source maps or not?
When npm packages actually need them, and how much install size they cost.
July 27
Cross-Origin Storage API: stop downloading twice
A proposed API to store big files by hash and share them across origins.
June 11
The quiet problem with unnecessary async
Marking sync code as async changes its contract and propagates Promises through callers.
June 5
The website specification
A platform-agnostic reference of features every quality website should have.
May 29
Replacements.fyi: performant, safer npm package alternatives
Find more performant and safer replacements for outdated or unnecessary npm packages.
May 28
CSS vs. JavaScript: exploring the performance implications of different animation strategies
How CSS, Web Animations API, GSAP, and Motion behave under main-thread congestion.
May 8
From React to native web with nanotags: a migration that saved 100 KB
How Evil Martians replaced React and Ark UI with Web Components and a 2.5 KB wrapper library.
April 27
The end of responsive images
How sizes="auto" with loading="lazy" lets browsers handle most responsive images.
April 24
Your options for preloading images with JavaScript
Five approaches compared with their caching and CORS trade-offs.