PostgreSQL Performance Tuning Checklist: 2026 Complete Guide

PostgreSQL is one of the most powerful open-source relational databases available today. It handles everything from small application backends to multi-terabyte analytical warehouses. But raw capability means nothing if the database is not tuned for your workload. A default PostgreSQL installation is configured conservatively — designed to run on modest hardware without consuming too many resources. That is sensible for a fresh install, but it leaves enormous performance on the table for production systems. This checklist is a comprehensive, DBA-focused guide to PostgreSQL performance tuning in 2026. It covers hardware, OS-level settings, core configuration parameters, indexing strategies, query optimization, connection pooling, vacuum management, partitioning, monitoring, caching, replication, and performance testing. Whether you are tuning a new deployment or troubleshooting a slow production database, work through each section systematically. Why Performance Tuning Matters Performan