>AFAIK the DLLs will be compiled once again on the server, before it will be used the first time. So the first user has to wait some time before the page appears.

So, its timeframe for the new update to kick in varies on the size of the DLL. That is what I have discovered so far. But, I am wondering what kind of operation IIS is doing with the .NET framework when the compile is being executed. Do you know if there are any files that would be created on the server or something like that?