[mattkol]

Like you, I have developed quite a lot of WPPF apps and still do (my day job!). I completely agree with all the points you made. Especially the point on composite control handling it's own wait indicator is spot on.

However, I believe @m_fayer is right too. The performance issue can creep up on you if you are not constantly watching it.

The weak-reference used by DelegateCommand in most WPF framework implementations - Prism, MVVMLight, Caliburn.Micro can cause extra headaches if one is not watching it. I have seen memory clogs with InputBindings; I have seen unexplaiined performance issues with ColumnSpan, RowSpan usages, and others issues I can't remember at the moment.

Buttom line is one needs to take C/C++ mindset to WPF to achieve optimal performance - that is you may have to have a strategy to clean up after yourself (just like pointers) and not rely too much on Garbage Collector (GC).