Psycopg2 vs Psycopg3 Performance Benchmark

The new PostgreSQL adapter for Python, psycopg3, has shown significant improvements compared to its predecessor, psycopg2. It introduces built-in async support and an improved connection pooling feature, enhancing efficiency for asynchronous tasks. Benchmark tests reveal that psycopg3 outperforms psycopg2 in various scenarios such as data decoding efficiency, overhead of creating and returning result records, I/O stress, array decoding, copying data from standard input (STDIN) into a PostgreSQL table, batch-inserting data, and basic arithmetic operations. The async version of psycopg3 performs even better in some cases. Developers are encouraged to upgrade from psycopg2 to leverage the performance gains brought by psycopg3, especially when interacting asynchronously with their database.