WP-Optimize這個Plugin可以協助wordpress網站進行優化，例如以下：
Optimize database tables
Clean all post revisions
Clean all auto-draft posts
Clean all trashed posts
Remove spam and trashed comments
Remove unapproved comments
Remove expired transient options
Remove pingbacks
Remove trackbacks
Clean post meta data
Clean comment meta data
Clean orphaned relationship data
參考：
12+ Best WordPress Plugins to Cleanup and Optimize Database and Improve Performance
