[perbu]

This post conflates scalability and performance. PostgreSQL is fast on smallish systems, but try adding more CPU cores and you'll see performance gains will not be linear at all. Modern server can ship with 256 or more cores and a single instance of PostgreSQL will struggle to take advantage of these.

4-8 cores is no problem at all, though.

[hephaes7us]

What kind of cases were you measuring? I would think that, e.g. 256 separate long-lived connections in a setup like that would scale less-than-linearly but not dramatically so?