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

[Hamish Moffatt]

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?


Thanks
Hamish