The core optimization is to buffer notifications in-memory and send them in a batch instead of sending them as part of every transaction. So that's a general-purpose optimization for Postgres apps using LISTEN/NOTIFY.

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mamcx 4 hours ago | parent [-]

So this is not inside a trigger but on the app connected to pg?

	▲	gordonhart 10 minutes ago \| parent [-]
		Yes, per the article they “scaled” Postgres to meet their requirements by altering their usage pattern to avoid hitting the bottleneck.