David Ebbo posted about a new flag to optimize ASP.NET compilation behavior.
According to David:
“we are introducing a new optimizeCompilations switch in ASP.NET that can greatly improve the compilation speed in some scenarios. There are some catches, so read on for more details. This switch is currently available as a QFE for 3.5SP1, and will be part of VS 2010.”
You can read more about it here.