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We're already syncing data to millions of clients in real-time behind a CDN, but our write path was heavily under-optimized. The result: high CPU usage, accumulating WAL on Postgres, and high end-user p95 latencies.

We've been running Electric in production for a year so we knew exactly what we needed: fast append-only writes and no data processing on reads. The performance gains exceeded our expectations.

The lesson: by shipping a system that works into production early and learning from it, allowed us to design a much better solution based on real-world requirements.

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