If you need to get some advice on your performance problems, then the right place to do so is the performance mailing list at http://archives.postgresql.org/pgsql-performance/.
You may want to first ensure that it is not a well-known problem by searching the mailing list archives.
A very good description of what to include in your performance problem report is available at http://wiki.postgresql.org/wiki/Guide_to_reporting_problems.