Hi Vijay,
The complex table data download may differ from device to device means the platform.
In ATE, the CT with huge data download would not take much time it will get downloaded in 2-4 Mins max.
But the same cannot be downloaded in iPad, it will definitely consume much time depends on the amount data is it is getting.
The CT data download based on the filters configured in CT MDO and the indexes maintained in Agentry editor.
If you want to improvise the performance of CT download in initial sync, please try to apply filters on MDO.
For delta sync, try modifying the TABLE_CHECK & TABLE_REFRESH parameters for particular complex table.
Before modifying these parameters, please analyze the frequency of master data update for CT in ECC. According to that you can set up the value.
Hope this helps!.
Thanks,
Roopa.