[Interest] porting to Qt 5.4 - MOC very slow on Windows

[Henry Skoglund]

 > I'm trying to port our app from Qt 4.8 to 5.4.
 > Currently working in MSVC 2013,
 > and using the pre-built Qt binaries for that environment.
 >
 > We have about 440 files being MOCed during build. On 5.4, each file
 > is taking 2-3 seconds meaning the overall build is significantly
 > longer than in 4.8.
 >
 > I found a reference to a similar problem here -
 > http://qt-project.org/forums/viewthread/47901 - which was due to using
 > MOC on a network drive. In my case everything is on local SSD.
 >
 > Any suggestions?

One trick I've used for speedup; since MOC ignores your .cpp files, is 
to move #includes of external .h files, for example
windows.h, from myclass.h to myclass.cpp.

Rgrds Henry