Sluggish graphics

[Russell Shaw <rjshaw iprimus com au>]

Hi,
In a thread, i call gdk_window_get_pointer(drawing_area->window,x,y,NULL).
If the window is 400x400, the call takes 0.13ms. However, if i make the
window close to full screen size, the call takes 300-350ms. And the mouse
cursor only responds to movement every ~300ms too. It happens about 70%
of the time. The other 30%, the call still takes ~0.15ms for a full window.

I have nothing being drawn in this window, or any others.
(500MHz PIII system, GTK2)

drawing_area created as:

  drawing_area=gtk_drawing_area_new();

  gtk_widget_set_events(drawing_area,
         GDK_EXPOSURE_MASK
       | GDK_ENTER_NOTIFY_MASK
       | GDK_BUTTON_PRESS_MASK
       | GDK_BUTTON_RELEASE_MASK
       | GDK_KEY_PRESS_MASK
       | GDK_KEY_RELEASE_MASK);