Create QPrinter is very slow under Qt5

Why under Qt 5.5 the creation of QPrint object is very slow:

QElapsedTimer timer;
timer.start();
QPrinter printer;
qint64 elapsed = timer.nsecsElapsed();
qDebug() << "The operation took" << elapsed << "ns";

Result:

Qt4.8.7
MSWindows 7 64bit (bin 32bit): The operation took 683 835637 ns
(683 ms)

Qt5.5
MSWindows 7 64bit (bin 32bit): The operation took 2423 792254 ns (2423 ms)
Ubuntu 14.04.3 LTS 64bits: The operation took 17 481614 ns (17 ms)

Big difference with Linux system...

https://forum.qt.io/topic/60815/create-qprinter-is-very-slow-under-qt5