refreshing all listgrid rows at once

[lchen]

i have to change the data in bulk in list grid, 2-3 fields of around 300 rows, so i do the below.
for(var i = 0; i < data.length; i++){
var rowNum = LisGrid.getRecordIndex(data[i]);
var wsRecord = LisGrid.getRecord(rowNum);
wsRecord.FieldX = data[i].FieldX;
wsRecord.FieldY = data[i].FieldY;
LisGrid.refreshRow(rowNum);
}

as the script is long IE always gives an error that script is takking too long do u want to stop, is there any way i can refresh the changed rows at once instead of doing one by one