I just tried using pg_pconnect() and I didn't notice any significant
improvement. What bothers me most is that with Postgres I tend to see
jerky behavior on almost every page: the upper 1/2 or 2/3 of the page
is displayed first and you can see a blank bottom (or you can see a
half-filled completion bar). With MySQL each page is generally
displayed in one swoop.
Persistent connections are useful when your page is fast and the
connection time is an important part of your page time. It is mandatory if
you want to serve more than 20-50 hits/s without causing unnecessary load
on the database. This is not your case, which is why you don't notice any
improvement...
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