Would you mind explain what you mean when say: 'for 200 hundreds'??

We have several installation of PoS on production and the only time that we have seen a similar issue was when there is a bad Postgresql configuration so it runs very slowly.

For good reference about the Postgresql optimization, please review this arthicle: http://wiki.postgresql.org/wiki/Performance_Optimization

200 hundreds order sale pos, please help me with postgresql for best perfomance.

regards.