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Not sure what's going on here, but one connection per process seems... ancient.

Using threaded model is difficult, how about pre-fork? Some connections per process is a good improvement.

The issue is costlier (runtime, complexity, memory) resource sharing, not the cost of the fork itself. Pre-forking isn't going to help with any of that.

Isn’t this why pgbouncer is so effective? Maybe it’s not the forking itself, but there is something about creating connections that is expensive, warranting such external connection poolers.

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