I see what you mean about distortion, and I couldn't find a quick fix (unless you want to restrict the zoom to about 2, which is doubtful)... but there are things we can do to make re-drawing much faster, to the point where I think it could be acceptable to do that for
zooming. I re-arranged the code in cmdImport_Click slightly, so that it had two loops - one to just load the data in to the ...