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

GitBook hosts 30,000 documentation sites on a single Vercel deployment, serving 120 million monthly page views.

The platform processes 40,000 cache invalidations daily, each resolved in under 300 milliseconds, using tag-based invalidation triggered by merge events.

AI-driven traffic now accounts for 41% of all page views, having surged 5x year-over-year in 2025.