[KraftyOne]

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.

[mamcx]

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

[gordonhart]

Yes, per the article they “scaled” Postgres to meet their requirements by altering their usage pattern to avoid hitting the bottleneck.