The original title is quite long and technical. Let me rewrite it to be punchy while preserving key facts.

Short summary

PostgreSQL connection management becomes a bottleneck under heavy load because each connection forks a backend process. PgBouncer addresses this by maintaining a persistent connection pool and mapping virtual client connections to real backend connections only when needed. The article covers three pooling modes — session, transaction, and statement — recommending transaction pooling for significant throughput gains, and provides a detailed pgbouncer.ini configuration for achieving a 4x throughput increase.

• •Transaction pooling is the sweet spot for 4x throughput gains, balancing reuse and compatibility
• •Each PostgreSQL connection forks a backend process; PgBouncer amortizes this cost via pooling
• •Key parameters include pool_mode, default_pool_size, min_pool_size, and reserve_pool_size

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