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

Take a look at NGen. Another option is to use ILMerge to merge all your assemblies into one. Whenever I use ILMerge, I add a post build command to so it happens automatically. The other alternative (untested) is, if you don't mind a longer start-up time, you could manually call Assembly.Load() at the beginning for each assembly.