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

GitBook, an AI-native documentation platform, hosts 30,000 documentation sites on Vercel, serving 120 million monthly page views, with 41% of traffic from AI crawlers. The platform's integration with Vercel has addressed the challenge of keeping documentation fast and current by utilizing tag-based cache invalidation, which ensures that only affected content is revalidated during updates. This approach has enabled GitBook to process 40,000 cache invalidations daily within 300 milliseconds, supporting its commitment to providing fast and reliable documentation akin to production code. The rise in AI-driven traffic, which surged fivefold in 2025, has necessitated robust caching strategies to handle unpredictable traffic patterns while maintaining consistent content and predictable infrastructure costs. As GitBook continues to scale, it aims to enhance its caching infrastructure to accommodate adaptive documentation features and the increasing volume of requests, ensuring low latency and high predictability in delivering documentation.