Looking an efficient alternative for [myTableView reloadData] in objective c

Looking an efficient alternative for [myTableView reloadData] in objective c

I have a refresh button to get current data and reload the tableView. I'm
using this method to do this:
[self getCurrentData];
[self changeArrayObjectsWithNewDatas];
[self.myTableView reloadData];
But after a while, the application is slowing down. That's why I'm looking
an efficient alternative for [myTableView reloadData]