I haven’t seen many performance problems but if I do, this looks like a useful tip:
“For Perf debugging, a way to tell when you are causing a redraw is to turn on the control’s EnableRedrawRegions property.
agControl.settings.EnableRedrawRegions = true;
With this feature on, when a section of the plugin causes a draw, that section will draw in a different color. This setting is not for those susceptible to seizures =P”