Description
Only check the Copy data from server parameter when the ArcGIS Server account cannot be granted access to the Target Cache Path parameter value. When this parameter is checked, cache tiles are first copied to the ArcGIS output directory and downloaded to the Target Cache Path value on the client. For Python, using the DO_NOT_COPY option for the copy_data_from_ server parameter will move cache tiles from the service cache directory to the target_cache_path parameter value, which will be faster but requires that the ArcGIS Server account has write permissions to the target_cache_path value.
Solution
Grant write permissions to the ArcGIS Server account at the Target Cache Path parameter value to gain better performance. Uncheck the Copy data from server parameter. In Python, set the copy_data_from_server parameter to DO_NOT_COPY.