When we used User created objects, we should ideally cleanse data of user-created objects on the server. There may be number of objects for this dashboard & QMC does not provide a powerful interface to remove batches based on user, last usage time, size or by any other fields. This leaves us with the option of removing server objects one-by-one & checking the performance after every remove to see if it solved the problem. Often a single object which is causing the file size to huge & the performance degradation. Then checking the objects one-by-one is not very good when there are number of objects.
Powertools has a utility to clear these performance issues.
https://community.qlik.com/docs/DOC-5903
