--- chatview.cpp.old	2008-08-31 18:46:45.000000000 +0000
+++ chatview.cpp	2008-08-31 18:46:49.000000000 +0000
@@ -50,6 +50,15 @@
   setAlignment(Qt::AlignBottom);
   setInteractive(true);
 
+  // We don't need any of those as we just draw text and horizontal/vertical lines.
+  setOptimizationFlag(QGraphicsView::DontClipPainter);
+  setOptimizationFlag(QGraphicsView::DontSavePainterState);
+  setOptimizationFlag(QGraphicsView::DontAdjustForAntialiasing);
+
+  // Not sure which of these two is the fastest.
+  //setViewportUpdateMode(QGraphicsView::BoundingRectViewportUpdate);
+  setViewportUpdateMode(QGraphicsView::SmartViewportUpdate);
+
   _scene = new ChatScene(filter, filter->idString(), viewport()->width() - 2, this); // see below: resizeEvent()
   connect(_scene, SIGNAL(sceneHeightChanged(qreal)), this, SLOT(sceneHeightChanged(qreal)));
   setScene(_scene);