I am seeing more interest in building richer UX in WPF of late which is great. Since WPF is very powerful and very flexible, we are beginning to see developers hit UX performance issues as they build increasingly rich and exciting UI. The good news is we have a new release of our Performance Profiling tool for WPF with a better UI, new tools and increased capability. I have not myself had a need to use it in anger (My WPF UI is still pretty much grey screen stuff) but this tool is looking great. 

Visual Profiler