ResultSet performance question

I'm having a performance issue with Postgresql, but only when using the JDBC
driver. I'm looking for any suggestions.

I have a very simple query that returns about 7000 rows from a temp table.
Using psql the query returns in under 3 seconds. Using the JDBC driver it
takes around 30 seconds to run the same query.

I have looked at the query plan using both methods of execution and they are
identical. I have played around with setFetchSize() and used
con.createStatement(ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY);
But, since I am trying to get all of the results and it is total runtime I am
worried about server side cursors don't seem applicable.

I have also created a Java class that does nothing but issue rs.next() calls
through the ResultSet to time the execution without any other work being
done.

I can't believe that I am not doing something wrong as the difference in
execution time is extreme. Is this normal?

Any advice would be greatly appreciated.

Thanks,

Craig