Did the switch of the election-results page from postgresql to mysql today. It’s about twice as fast (crappy statistics there, but it’s an approximation).
This is using InnoDB tables.
With prepared statements we should be able to increase performance even further. I enabled the query log for a load of the page – we’re doing about 3,500 queries. Hrrm…. not so good. But using prepared statements should give us maybe another decent boost (a fair bit IIRC the parser overhead)