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The most impactful optimization begins with indexing. You should examine slow query logs via MySQL’s `slow_query_log` feature to identify queries that are missing indexes or using inefficient ones. For instance, the `pre_forum_thread` table frequently runs queries filtering by `fid` (forum ID), `lastpost`, and `displayorder`. Adding a composite index on `(fid, lastpost, displayorder)` can dramatically reduce the time needed to list threads in a particular forum. Similarly, for `pre_forum_post`, a common query retrieves posts within a thread sorted by `dateline`. An index on `(tid, dateline)` is crucial, but note that Discuz also frequently checks for invisible or deleted posts, so including `status` in the index might help. However, be cautious: too many indexes on a heavy-write table like `pre_forum_post` can degrade INSERT performance. Thus, a balanced approach is to keep only the essential indexes and periodically drop unused ones using `pt-index-usage` from Percona Toolkit.
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