How GitBook serves 30,000 sites with sub-second content updates

In three linesGitBook hosts 30,000 documentation sites on Vercel, serving 120 million monthly page views. The platform uses Next.js `use cache` directive to invalidate cache in under 300ms per site, processing 40,000 daily invalidations. 41% of traffic comes from AI crawlers.

Summary generated by Claude — human-verified