AI created slow and expensive code. How I analyzed and fixed it.

An AI-built browser game portal started exceeding Firebase free-tier limits and slowing down.

The developer used billing, query, and latency metrics to pinpoint the worst hotspots.

The main issues were inefficient Firestore access in a nightly cleanup job, a heavy profile endpoint, and an expensive random-seed generator.

They began replacing broad scans and repeated queries with more targeted Firestore reads to cut cost and latency.