I discovered a handy website that allows you to tune the performance of a PostgreSQL database server by generating settings based on your hardware and software configuration. I am using a configuration generated by this site since last week here on the Linux Compatible server and the performance improvements are noticeable.

PGTune - calculate configuration for PostgreSQL based on the maximum performance for a given hardware configuration

You need provide basic information about your hardware configuration, where is working PostgreSQL database. Results will be calculated after clicking "Generate" button

PGTune - calculate configuration for PostgreSQL based on the maximum performance for a given hardware configuration