On VS2015 Update 1, we can use /DEBUG:FASTLINK on our Debug builds to improve link times and reduce the size of the PDB files. We can't do this for optimized/production builds, however, as we want the PDB files to contain all the debug info so that we can distribute them without the obj files.
http://blogs.msdn.com/b/vcblog/archive/2015/10/16/debug-fastlink-for-vs2015-update-1.aspx