Instruct (non-thinking) for reasoning tasks:
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There’s only a limited amount of sync a disk can handle. We used pg_test_fsync to estimate how many WAL syncs per second the hardware could sustain. On a gp3 EBS disk, we reach around 1,000 syncs per second using 8 kB writes. Once that limit is reached, Postgres starts batching commits, which introduces latency.