QPainter::drawText with different fonts consumes huge amount of memory which does not get released

With this code, my program consumes an additional 100MB of Memory on a Windows 7 x64 – MSVC10/MSVC9 computer using Qt 4.7.4, 4.8.0, 4.8.1 and 4.8.2. Also if the painting is done, the memory does not get released.

Is this memory consumption normal?

void MyWidget::paintEvent(QPaintEvent *event)
{
  QPainter p(this);
  QFont f(p.font());
     
  int fHeight = height();
     
  for (int s=5; s<500; s++)
  {
    f.setPixelSize(s);
    p.setFont(f);
    p.drawText(0, fHeight, "Hello World");
  }
}

This code is just a sample to easily show the behaviour. In my case i have a lot of painting going on with different font sizes, which comes at the end to the same issue.