Check if there is an error in the Monitoring / Current Status menu, you will probably have some “BackgroundJobSearchIndex” or “failing background jobs” error, execute the following command:
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systemctl stop zammad (Stop the Zammad application)
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zammad run rake searchindex:rebuild (Rebuild your elasticsearch index)
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systemctl start zammad (Start the Zammad application)
This process can take a few hours if there are too many failed jobs
Your server performs well and is larger than the one being used by Zammad Application, below is a link to configure your server and get better performance: