I'm trying to convince my co-workers to switch from a web site project to a web application project, because I want the use of the project file. However I can't diffuse this argument against:

• The web site project allows each page to be compiled into a single dll. Their argument is this enables easy fixing of errors found after publishing. This is contrast to how the web application project compiles all code behind into a single dll.
• Is updating a single page's dll essentially different to updating the entire site's dll?
• Is there some way to compile each page's code behind into a seperate dll in the web application project?
• Are there some prohibitive (performance,memory?) costs to compiling each page's code behind into seperate dll's that we are unaware of?
• Why is the feature(?) to compile each page to separate dlls in web site projects and not web app projects?