Slow compilation of a ASP.NET Web Deployment Project in Visual Studio 2010

Question

I've migrated a large ASP.NET solution from Visual Studio 2008 (.NET 3.5) to Visual Studio 2010 (.NET 4.0).

I also installed the new version of the Web Deployment Project for VS 2010, because the solution also includes a web deployment project which I'm using to precompile .aspx/.ascx etc. into a single DLL.

I've noticed that the new version of the web deployment project takes way more time to compile and merge the assemblies - instead of 5 minutes in VS2008 it takes 15 or 20 minutes now in Visual Studio 2010.

Does anybody know what could be the reason for such a performance loss?

UDPATE

I ran Process Manager during the compilation. It showed me that aspnet_merge is spending a lot of time on accessing (file IO) assemblies which in my opinion should not be part of the merge process.

For example, even .NET Compact Framework assemblies which I am sure I'm not referencing in any way are accessed on file level (at least that's what Sysinternal's Process Manager shows me.)

Answer 1

had about the same thing. checking processes and swapping showed lack of memory. VS2010 was swapping it's feet off. So upgraded memory to 6GB and works like sunshine. Whats your hardware config?