Users Bulk Load into FIM best approaches

Hi,

We have a requirement of Loading users into FIM using .CSV files. Currently we have implemented using FIM Sync. Below are the MA s we used to Export the users to FIM and then to FIM Sync.

SQL MA

FIM MA

ADDS Ma

We are looking into areas of improvising with respect to performance. What can be better approach for Bulk Load of users into FIM? Can we use FIM Client/FIM API instead of FIM Sync? Please Suggest.

Thanks

Prasanthi.