If you need to get some advice on your performance problems, then the right place to do so is the performance mailing list at the following URL:
You may want to first check 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 the following URL:
More performance related information can be found at the following URL:
Another good reference for all performance related information is the "High Performance PostgreSQL 9.0" book, also by Packt. ...