FWIW, a good chunk of the snapshot scalability changes are in PG 14, so the situation has gone a bit further towards s/processes/threads/ being the primary bott

FWIW, a good chunk of the snapshot scalability changes are in PG 14, so the situation has gone a bit further towards s/processes/threads/ being the primary bottleneck. It depends quite a bit on whether you're write-mostly (bottlenecks almost completely unrelated to processes vs threads) or read-mostly. And in the latter case whether it's a context switch heavy workload (processes vs threads may be a significant factor), or not (processes vs threads can be a significant factor, but less likely).