Preload all assemblies (JIT)

Question

We are taking a hit the first time some heavy UI screens are loaded. Our project is divided into one main executable and several DLL files. The DLL files can also contain UI

Answer 1

You can just create instances of the classes located in externall assemblies. Just call the constructor in a limited scope (I mean declare the variable inside a function. It should not be global var because it will delay GC to dispose that instance). This will load the assembly, compile it and cache it. You can even do this in a background thread so the main thread will keep responsiveness.