jQuery Grid Plugin - jqGrid

  Hi ! I have a problem with performance.

I have to work with two grids in one page, add and remove row data. The problem is when user choose to display 50 records each page. And then selected all, click button add to add to an other grid, it's too slow, especially in IE. I wanna ask if there is a solution, thanks in advanced.

my code

for(var i=selectedRows.length-1; i>= 0; i--){
                var data = $("#grid_test_case_list").getRowData(selectedRows[i]);
                gridAssignedTestCase.addRowData(selectedRows[i],data, "first");
            }