>In my case, problema is that after optimization at server side, results get different.
Do you mean "wrong results" kind of issue?
which driver version are you using?
Generally speaking, it is worth submitting "bad performance when using
prepared statements" issues to PostgreSQL hackers team.
If just a couple of SQLs behave badly due to server-prepared
statements, then it might make sense just tune the statements in
question.
Vladimir
