Facing issues with 83 jobs per second (5k/min) sounds like an extreme misconfiguration. That's not high throughput at all and it shouldn't create any appreciable load on any database.

This comes up every time this conversation occurs.

Yes, PG can theoretically handle just about anything with the right configuration, schema, architecture, etc.

Finding that right configuration is not trivial. Even dedicated frameworks like Graphile struggle with it.

My startup had the exact same struggles with PG and did the same migration to BullMQ bc we were sick of fiddling with it instead of solving business problems. We are very glad we migrated off of PG for our work queues.