OS X: QCoreWlanEnginePlugin eats huge CPU in almost idle app

#include "main.h"

#include <QtCore/QTimer>
#include <QtCore/QCoreApplication>
#include <QtNetwork/QNetworkAccessManager>

// cpu is hugely used only if qcorewlanengineplugin is imported
#include <QtCore/QtPlugin>
Q_IMPORT_PLUGIN(QCoreWlanEnginePlugin)

int main(int argc, char *argv[]) {
	QCoreApplication a(argc, argv);

        // quit in three minutes
	QTimer::singleShot(180000, &a, SLOT(quit()));

        // cpu is hugely used only if manager is created
	QNetworkAccessManager manager;

	return a.exec();
}