Grid performance on adding row dynamic

When I add a row to the grid dynamically cpu jumps to 40%. We had the same problem for updating columns, we are trying to keep a timer going for each row so we update columns a lot, if we do this the conventional way cpu usage jumps to 50% every second with 10 rows in table (1 timer). We now use standard getElementById(columnreference).innerHTML and now CPU usage went down to 4%.

Have no idea how to accomplish the same for adding a row dynamically. All we want to do is add row, not repaint entire grid every time we add a row. Do you have any plans for updating this and if so when can we expect this? Perhaps you have some example that shows how i can add a row without refreshing entire grid?

Thanks in advance.