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You can try to use FileCache trait without installing Apc or Mem cache on PHP:
https://www.koolreport.com/docs/cache/file_cache/
If there's any issue let us know.
Can you give me some example ? By the way, I'm not using class to retrieve data, I'm using like Pure PHP example :
For large database, it's recommended that you use server side processing with paging to display data. For example:
https://www.koolreport.com/examples/reports/datagrid/server_processing/
https://www.koolreport.com/docs/datagrid/datatables/#custom-attributes-serverside
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