Why does use of pens with dash patterns cause huge (!) performance degredation in WPF custom 2D drawing?

Question

Hope anyone can shed light on this so I can use pens with dash patterns?

I am writing a scrollable chart (a Panel inside ScrollViewer that

Answer 1

You should use Perforator to dig deeper into the performance issue. Here's a link to the MSDN site talking about various WPF performance tools. Perforator would probably be the tool that will help you the most, specially in determining if the lines are being drawn using the software renderer (which would be the greatest factor in giving you such bad performance).

If the problem is that they are being drawn in software, you might have to write your own ShaderEffect, but that will probably get tricky fast unless you are familiar with HLSL.