After loading data with pg_restore or similar tool, you should run ANALYZE or VACUUM ANALYZE on your entire database to collect new statistics. If those commands haven't been run after a restore the database won't have up-to-date statistics about the tables and indexes which may lead to bad query plans.

More details about ANALYZE can be found in PostgreSQL documentation: https://www.postgresql.org/docs/current/static/sql-analyze.html

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