My previous post about Exchange 2007 SP1 RU5 at () explained why Exchange Services where so slow to start after RU5 was applied : .Net code checks for the Microsoft Certificate Revocation List at each startup.
As explained in http://support.microsoft.com/?kbid=944752, a .config file with
<configuration> <runtime> <generatePublisherEvidence enabled="false" /> </runtime> </configuration>
saves the day.
Now you can also need this magically .config file for virtually any .NET based code that run in a non-internet connected environment,
Those files have to be created in the same directory the .exe is and that's it.
So you get the picture, create .config files when .NET application OR good old native win32 app that call into .Net dlls are slow to start.