title: How to remove the time delay before a QToolTip is displayed?
body: <p>I have a custom <code>QGraphicsItem</code> with a <code>QToolTip</code>. When hovering with the mouse on them the tool tip shows fine, but there is a small delay before the tool tip shows.</p>
  
  <p>How can I decrease that delay, so the tool tip will show immediately?</p>