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copied!<p>I'm not sure this applies to your problem, but I'll post it here anyway since it might help someone:</p> <p>If not all of the images in the drawing group is going to be visible at the same time, you could set the <a href="http://msdn.microsoft.com/en-us/library/system.windows.media.drawinggroup.clipgeometry.aspx" rel="nofollow noreferrer">ClipGeometry</a> property to whatever you want it to draw. This effectively tells WPF that the parts outside of the geometry is not needed and will be skipped during rendering.</p> <p>A few other things you could experiment with are:</p> <ul> <li><a href="http://msdn.microsoft.com/en-us/library/ms750509.aspx" rel="nofollow noreferrer">Freeze</a> the drawinggroup before applying it to your image source. At least it couldn't hurt (unless you really need to modify the instance, but remember you could always just create a new one instead of modifying the old)</li> <li>Try different ways to display your drawinggroup. For instance as a <a href="http://msdn.microsoft.com/en-us/library/system.windows.media.drawingvisual.aspx" rel="nofollow noreferrer">DrawingVisual</a> (which is considered light weight) or as a <a href="http://msdn.microsoft.com/en-us/library/system.windows.media.drawingbrush.aspx" rel="nofollow noreferrer">DrawingBrush</a> to paint e.g. a rectangle.</li> <li>Combine the small images into smaller groups which you then combine to your bigger group. No idea if this improves or hurts performance, but it could be worth trying.</li> </ul>

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