Compared to MyISAM? Sure for certain aggregate functions, but it's too easy to point out reasons for avoiding MyISAM: fragmentation, no transactions, table locks on writes, complete table rewrites to change columns or indexes, only scales up to about 8 cores.

Compared to InnoDB? You are incorrect, Postgres is faster, even for a raw count(*), even when comparing against the InnoDB plugin and not the ancient InnoDB builtin.

I have access to tuned TB+ DBs of both types and am happy to disprove any specific examples you can provide.