testrealtime update rate

Hi,
I am using modified code from testrealtime.c and I am having a problem
getting it to update quickly.  It seems as though when I set the
gtk_timeout_add to anything below 100, it makes no difference in screen
refresh rates.

I would just like to refresh the data points every 30ms.  It seems the
gtk_plot_canvas_paint(GTK_PLOT_CANVAS(canvas)); is the speed culprit, but
without it my graph just redraws itself on top of the previous one. Is there
a quicker way to get rid of the old plot and redraw to achieve a higher
rate?  My modified update code is:
(my px/py data is created in another function as px=1..20 and py is all
0's.  I am just making one point grow for test purposes)

gint
update(gpointer data)
{
 GtkPlot *plot;
 gdouble x, y;
 gdouble xmin, xmax;

 plot = GTK_PLOT(data);


   py[10]+=.01;

 gtk_plot_data_set_numpoints(dataset, 20);
 gtk_plot_data_set_x(dataset, px);
 gtk_plot_data_set_y(dataset, py);

 gtk_plot_canvas_paint(GTK_PLOT_CANVAS(canvas));

 gtk_plot_refresh(plot, NULL);
 return TRUE;
}


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