Popularized by Next.js, ISR first generates static HTML as SSG does. After a configured revalidation interval, such as 60 seconds, a subsequent visitor triggers background regeneration of that page. Visitors immediately receive the cached version, which may be slightly stale, while a new version is prepared for later requests. This stale-while-revalidate pattern suits news and e-commerce sites with many pages where rebuilding everything at once would be inefficient.
Some websites are seeing sharp increases in site: operator queries in Search Console performance reports. Explore possible causes, measurement effects and diagnostic responses.
