DevExpress controls for WPF load time
To resolve this issue, I suggest that you ngen our assemblies and use the DXSplashWindow (11.1) or create a similar window manually and show it when the main form opens for the first time.
This slowdown is caused by JIT and theme loading.
The RunTypeInitializers simply calls an object constructor. WPF themes are not loaded at this moment because this happens only when a control is about to be shown and the visual tree is generated.
A possible solution to this problem is to create an invisible window which will contain all our controls, then show and hide it. However, I do not like this approach. In my opinion, it is better to show a splash window.