How Anthropic Made Claude's Apps 3x Faster in Two Weeks — A grab bag of performance lessons from a sprint that cut p75 'time-to-typeable' from 3.1s to 0.55s. Em dashes (the irony!) pushed V8 onto a slower regex path, a stray location.reload() caused half a million hidden reloads a day, and more.

Wang, Attard, and G (Anthropic)

Still Writing Tests? Meticulous Is Here — Notion, Dropbox and Wiz are now using a testing paradigm they can’t ship without. Built by former Palantir engineers, Meticulous creates an evolving suite of deterministic E2E UI tests, delivering exhaustive coverage with zero developer effort.

Meticulous AI sponsor

Vite+ 1.0: One CLI for Your Entire JavaScript Toolchain — The single vp command can now manage your Node runtime (if you wish), package manager, dev server, linting, formatting, testing, builds and task running, configured from vite.config.ts. vp migrate can be used to bring existing Vite, Vitest, ESLint, tsup, and similar setups into Vite+.

VoidZero

The Grand Unifying Architecture of Frontend — SolidJS's creator argues that HTMX, React, LiveView, and friends differ mostly in how they split the same three jobs (navigation, content, and instant UI feedback) between client and server. He then shows how Solid 2.0 aims to cover the whole spectrum.

Ryan Carniato

Build Products That Help People Build Their Lives — Fidelity technologists can change the way our clients invest - for the better and for everyone.

Fidelity Careers sponsor

Optimizing Objects with null Prototypes — In V8, objects created with { __proto__: null } or Object.create(null) start in a slower 'dictionary mode'. Matteo shows how creating a plain object and then setting its prototype to null preserves fast properties.

Matteo Collina

Node.js Built-ins That Replace npm Packages — A tour of 12 Node built-ins that replace common ecosystem packages along with their stability levels and some gotchas that might keep you using the established alternatives.

Flavio Copes

Size Limit: A JavaScript Performance Budgeting Tool — Set a size or load-time budget for your code and this tool can fail CI (or flag a PR) if a change goes over it. You can also do one-off checks and see visualizations of where the bytes are. Framework-agnostic and doesn’t care which bundler or CI you use.

Andrey Sitnik

Your UI Gets Blamed for a Slow Query — TimescaleDB extends Postgres so the query behind your UI returns fast as data grows. Get $1000 credit to start.

Tiger Data (creators of TimescaleDB) sponsor

EmDash 1.0: Cloudflare's WordPress 'Successor' is Now Stable — An Astro-based alternative to WordPress, now with a decentralized AT Protocol-based plugin registry and plugins that run in sandboxes. It’s not Cloudflare-only, either, as it also runs on Node.js.

Buscemi, Kane, and Pham (Cloudflare)

📝 DOCX 9.8: Generate Word .docx Files from JavaScript — A comprehensive library for generating docx files. It’s only a few months since we linked to it, but this is a big release with support for charts, shapes and watermarks, plus more math notation support. (Homepage.)

Dolan Miu