BI publisher reports using Custom Subject Area objects show Slow Perfomance

Summary:

Hi, we defined several custom objects in our sandbox and created Custom subject areas to develop reports by using fusion bi publisher

In general, reports are working fine but we are having issues because those reports takes till 10 seconds to give us output, however data volumen is very small

I would appreciate advices about this perfomance problem

Version (include the version you are using, if applicable):

erp cloud fusion 24c