Issue with Angular UI grid - expandable all row (Sub grids)

[shettyabhishek]

I have a grid that has expandable rows and each row when expanded shows a sub grid. But the rendering of the sub grids is taking too much of time, even when there are only 50 rows and when i execute expand all rows. Using the bellow method
$scope.gridApi.expandable.toggleAllRows();

My understanding is some of the subgrid columns are having cell templates, which is causing the excess rendering time.

Any suggestion or some psuedo code would b really helpful .