PostgreSQL 8.4 x Win 2008 - slow connection

I'm having problems with connection time using Post 8.4 on Win 2008 enterprise (32bits). To do open/close 10 connections i lost about 20 seconds and doing the same test using Post 8.4 in another server (Win 2003) on 20 seconds i get (open/close) almost 500 connections. The difference is very very large. Somebody did have any problem like this?

 

Some tip is very well!!!

 

thanks

Fábio Henrique Gibon