Thank Vlad for your reply.

I was reading it and I think your advise is very good however I don`t know anything about the ADO technologic.

Your comment about the slowness of the connection is very sure, I see it executing the view from the window command of VF; above all when I am consulting a table with many record (more than 100 thousand).
Although another been seen they execute quickly.

The users that would have access to the system will always be in my Intranet connected to speeds of until T1 and not in the Internet, I mean the system won't be used from outside of the organization.