A Costly function + LIMIT

PostgreSQL 7.2.3

I have a function that is quite costly to run on 1000's of records... Let's
call it "widget".

I have a query

(SELECT name, address, city, state, zip, widget(name, address, city, state,
zip)
FROM eastern_usa
ORDER BY state, city, zip, name
LIMIT 5000)

UNION ALL

(SELECT name, address, city, state, zip, widget(name, address, city, state,
zip)
FROM western_usa
ORDER BY state, city, zip, name
LIMIT 5000)

ORDER BY 4, 3, 5, 1 LIMIT 100 OFFSET 0;

It runs "widget" on 10000 records. The damage would be negligible if it could
run on the 100...

Any ideas?

CG

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