The Query Accelerator docs https://github.com/Alfresco/acs-packaging/blob/master/docs/query-accelerator.md should have a section that talks about example times. Just how fast should a query be? How long will it take to populate a table. Cage the times in terms of our test 150 million node database and that obviously there will be variation depending on configuration and deployment environment.
Turning on the following debug will give you time before and after: