Explanation

Scenario: User1 reports that performance is slow when viewing total billed customer time.
A plug-in for Dynamics 365 Sales automatically calculates the total billed time from all activities on a particular customer account, including sales representatives' visits, phone calls, email correspondence, and repair time compared with hours spent.
Reference:
https://docs.microsoft.com/en-us/dynamics365/customerengagement/on-premises/developer/register-deploy-plug