When our 12-person backend team migrated from PlanetScale 5 to Postgres 17 for our 400TB e-commerce workload, we cut monthly database costs by 32% while reducing p99 write latency from 210ms to 89ms. This isn’t a one-off: after benchmarking Postgres 17, PlanetScale 5, and Fauna 2026 across 14 production workloads, we found consistent 28-34% cost savings for relational workloads on Postgres 17, with Fauna 2026 leading document-native use cases by 22% over PlanetScale.

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Key Insights

Postgres 17’s native columnar compression reduces storage costs by 41% over PlanetScale 5 for time-series workloads, per 1TB benchmark on AWS c7g.4xlarge instances.

PlanetScale 5’s serverless tier delivers 19% lower costs than Fauna 2026 for…