...
Note: The response to this service by default includes also the full details of a number of sub-entities related to projects on a one-to-many basis, namely Project Roles, Project Rate Types, Project Task Types, and Project Tasks. If you don't need that data, please simplify your request by using the ExcludeSubEntityElementsFlagparameter, which will also cause the service to operate faster and with greater efficiency.
If you only need information about one or two of these sub-entities, please consider as an alternative the simpler, faster, and more efficient services:
...