It always annoys me to hear people talking about how slow MySQL is and have to deal with them going about modelling things poorly and sweating a few million row

It always annoys me to hear people talking about how slow MySQL is and have to deal with them going about modelling things poorly and sweating a few million row when they don't know how to design indexes properly and don't understand predicate order.. Or correlated sub-queries. That said, PostgreSQL is pretty fantastic software too.