Are there problems with rendering WPF over Remote Desktop under Windows XP?

As of .NET 3.5 SP1, all WPF graphics are remoted as bitmaps, even on Vista-to-Vista communication. From http://blogs.msdn.com/jgoldb/archive/2008/05/15/what-s-new-for-performance-in-wpf-in-net-3-5-sp1.aspx:

We now remote as bitmaps in ALL cases.

The reason is that WPF 3.5 SP1 nowuses a new graphics DLL (wpfgfx.dll)and certain changes could not be madeto Vista’s existing graphics DLL(milcore.dll) that is also used byDWM.

As other commenters have noted, the performance will greatly depend on the design of your application’s UI. The potential upshot is that you only have to test in one scenario; remoting performance should now be the same regardless of the client or server.

We have had no problems using both Remote Admin and Bomgar for remoting once those apps were updated to work with WPF. We've tested XP to XP, XP to Vista, Vista to XP, and Vista to Vista. We'd initially only had problems with tooltips and combo-box drop downs/popups. For the last six months or so, things have been fine.

I just tested remoting into a Vista VM from my XP desktop and our app looked great (if running a bit slow, but it is a VM...) I switched to low quality 8-bit color and the performance problems almost completely went away. The gradiation, etc, was lost on our window background, etc, but it was definitely still usable.

I don't think you should have any functional problems, and only minor performance issues.

i guess this depends on your wpf app.if you have lots of gradients, animations, brushes, etc...your app will definitely run slower over the wire...