Performance

Median time per operation, lower is better, beside postgres_async, a native OCaml driver on Async, and libpq, the C library, through the postgresql bindings.

	postgres-eio	postgres_async	libpq
Round trip, select $1::int	329 µs	582 µs	287 µs
Insert, one round trip each	337 µs	594 µs	296 µs
Insert, 1,000 pipelined in one round trip	5.0 µs	n/a	n/a
Read a 100,000-row result, per row	138 ns	142 ns	169 ns
Client CPU per round trip	41 µs	51 µs	21 µs

Measured with postgres-eio 0.1.0, postgres_async 0.17.0, postgresql 5.4.0. Apple M4 Pro, Postgres 18.6 in Docker, one connection per driver, text results, median of three 5 s runs.