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How does ISR (Incremental Static Regeneration) avoid serving stale content while maintaining performance?

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subina kallyani
hard
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Answer
  • ISR serves the cached static page to users while rebuilding the page in the background after the revalidate time expires.
  • First user after expiration triggers regeneration, but doesn’t wait for it — ensuring no downtime.
  • Once rebuilt, future users get fresh content.

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