Backup/Restore too slow

Hi,
We have a database with one table of 10,000,000 tuples and 4 tables with 5,000,000 tuples.
While in SQL Server it takes 3 minutes to restore this complete database, in PostgreSQL it takes more than 2 hours.
The Backup takes 6 minutes in SQLServer and 13 minutes (which is not a problem)

We are running PostgreSQL 8.1 for Windows and we are using:
C:\pg_dump.exe -i -h localhost -p 5432 -U usuario -F c -b -v -f "C:\BK\file.backup" base
and
C:\pg_restore.exe -i -h localhost -p 5432 -U usuario -d base -O -v "C:\BK\file.backup"

We use those parameters because we copied them from PGAdminIII.

Is there any way to make it faster?

Tanks
Sebastián
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