We have an RTC server instance, which has degraded performance (across functions and not just limited to loading of plans) over a period of time. Can we improve performance of the server by deleting unwanted work items. While I understand server configuration/tuning has a direct relation on the server performance, but given our limitations with server / hardware capacity, deleting work items is a viable option or not? Does the number work items (plan work items vs. execution tasks) really contribute to the performance of the server.