Perplexity's CobbleDB Replaces DynamoDB: 5.6ms Median Read Latency and ~20% Cost Savings

Perplexity ·

Key Info

Perplexity replaced DynamoDB with its in-house key-value database CobbleDB, cutting median batch-read latency from 31.4 ms to 5.60 ms and p99 from 123 ms to 24.2 ms, with internal estimates showing at least 20% cost savings.

Highlights

  • Median batch-read latency fell roughly 82% (31.4ms → 5.60ms); p99 fell about 80% (123ms → 24.2ms).
  • Perplexity's internal cost model estimates at least 20% savings relative to DynamoDB.
  • CobbleDB is an in-house key-value store built to serve web content for Perplexity search, developed with the help of always-on AI agents.
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