I've inherited some code using mappoint.
The code displays contour lines on the map using Shapes.AddPolyline, but it is very slow!
It appears that in the loop that adds all the lines, every time one is added the map has to redraw. I think that is what is taking all the time.
I've experimented with setting the control invisible before adding the lines, and then making it visible afterwards, and that does make things faster (about 3x faster), but it is still very slow.
Is there anything I can do to make this faster?