help with query speed

I have the below query written. I have removed a lot from the select
Statement for simplicity sake. The query takes way too long.
I am moving from an Access backend to a Postgres back with
Access in the front. The below query is taking like 14-20 seconds.
Is their a better way I can write the joins. I would think that
Postgres should be fast than Access. BTW I am writing these as
Pass through queries so it is not a problem with Access. I have
Even ran the query directly against Postgres.

SELECT
tblroster.transcriptlink
FROM
tblroster
FULL OUTER JOIN testclass ON (tblroster.classlink = testclass.classid)
FULL OUTER JOIN tblqualitypoint ON (tblroster.lettergrade =
tblqualitypoint.letter)
ORDER BY
tblroster.transcriptlink