Qt4.7.0 Phonon module slows down my app

[Apsta]

I have a simple code, that uses everybody...

Phonon::VideoWidget *vWidget = new Phonon::VideoWidget();
mediaObject = new Phonon::MediaObject(this);
Phonon::createPath(mediaObject, vWidget);
vWidget->setAspectRatio(Phonon::VideoWidget::AspectRatioAuto);
audioOutput = new Phonon::AudioOutput(Phonon::VideoCategory, this);
Phonon::createPath(mediaObject, audioOutput);

Phonon::VideoWidget *vWidget = new Phonon::VideoWidget();
mediaObject = new Phonon::MediaObject(this);
Phonon::createPath(mediaObject, vWidget);
vWidget->setAspectRatio(Phonon::VideoWidget::AspectRatioAuto);
audioOutput = new Phonon::AudioOutput(Phonon::VideoCategory, this);
Phonon::createPath(mediaObject, audioOutput);

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My problem is, that the third line (Phonon::createPath(mediaObject, vWidget)) takes about 5 seconds. Without it, my window shows immediately. But it is needed of course.
Is there any solution, how to speed up this?