How React streams UI out of order and still manages to keep order

Instead of waiting for every component to be ready, React streams what it can and leaves markers for the rest. When slow components finish, they arrive as hidden divs and get swapped into place by small scripts. This post walks through the full mechanism step by step

Ship 26 tickets just dropped

Vercel's Ship conference is heading to London, Berlin, New York, Sydney, and San Francisco. Talks and workshops focused on shipping AI agents and apps to production

⚡️ Sponsor: Blazity

Next.js migration toolkit that eliminates guesswork and protects production and stability

Most Next.js migrations from Pages Router to App Router follow the same pattern: a developer reads the docs, starts converting files, breaks something in production, then spends weeks firefighting.

The real problem with migrations are the edge cases nobody warns you about, and the lack of systematic approach.…