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For search functionality, Discuz’s built-in full-text search in MyISAM is notoriously slow. Migrate to Sphinx or Elasticsearch as dedicated search engines. Alternatively, use MySQL’s InnoDB full-text index with a proper `MATCH AGAINST` query, but be aware that this still requires optimizing the `ft_min_word_len` and `ft_stopword_file` parameters. For most forums, the best approach is to offload search to an external service, freeing the main database from heavy full-text scans.