Looks like he's using the default postgresql.conf settings in which case I'm not suprised at pg looking so slow. His stated use of foreign keys invalidates the tests anyway as MyISAM tables don't support FKs so we're probably seeing FK check overheads in pg that are simply ignore by MySQL. In an honest test, MySQL should be reported as failing those tests.
Either failures, or they should not have been using MyISAM, they should have used the table format that supports FK's. This is just not apples to apples.
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TIP 9: the planner will ignore your desire to choose an index scan if your
joining column's datatypes do not match
