# performance.dev

> Essays on building beautiful, fast web apps.

## Articles

- [Reverse Engineering ChatGPT Web:
How OpenAI Built for a Billion Users](https://performance.dev/chatgpt): A technical deep dive into how OpenAI built ChatGPT's web app: React Router 7, streaming SSR, code splitting, and feature flags at billion-user scale.
- [The Conductor Rewrite:
What They Changed to Make It Fast](https://performance.dev/the-conductor-rewrite): How Conductor rebuilt its app twice as fast: local-first SQLite, Tauri over Electron, TanStack Router, react-virtuoso, and Node to Bun.
- [How's Linear so fast?
A technical breakdown](https://performance.dev/how-is-linear-so-fast-a-technical-breakdown):  breakdown of the architecture behind Linear's speed: local-first sync, MobX observables, instant first loads, and a keyboard-first design.

## Optional

- [RSS](https://performance.dev/feed.xml)
- [Sitemap](https://performance.dev/sitemap.xml)