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Start by enabling query caching in MySQL, but note that the built-in query cache is deprecated in MySQL 8.0 and removed in later versions. Instead, leverage application-level caching. Discuz natively supports file caching and memory caching via extensions. The most effective setup is to use Redis for both data caching and session storage. In the `config_global.php`, set `$_config['memory']['redis']['server']` to your Redis instance. Then, enable “Forum cache” and “Thread list cache” in the Discuz backend. This reduces the number of times the database is hit for frequently accessed pages like the forum index and thread listing.