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Next.js 15.1 is unusable outside of Vercel
TBD
tl;dr: Starting with version 15.1.8, Next.js might break metadata handling for non-Vercel deployments, potentially devastating your search rankings. The root cause seems to trace back to performance complaints from developers dealing with computationally expensive metadata generation. Some users were experiencing significant delays during server-side rendering while generating metadata, particularly when fetching data from external APIs.
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