How to speed up a transparent QGraphicsTextItem in Opengl?

[wysota]

And what is the boundingRect() of the item?

Edit: I'm not able to reproduce the behaviour you observe using the following code. Can you change it so that it reproduces your problem?

#include <QtGui>                       
#include <QGLWidget>                  
 
int main(int argc, char **argv){
  QApplication app(argc, argv); 
  QGraphicsView view;           
  QGraphicsScene scene;         
  scene.setBackgroundBrush(Qt::blue);
  view.setScene(&scene);             
  view.setViewport(new QGLWidget);
  QString txt = "Some text";
  QGraphicsTextItem *item = scene.addText(txt);
  QFont f;
  f.setPointSize(36);
  item->setFont(f);
  item->setFlag(QGraphicsItem::ItemIsMovable);
  item->setCacheMode(QGraphicsItem::ItemCoordinateCache);
  QTransform trans;
  trans.rotate(60, Qt::YAxis);
  item->setTransform(trans);
  item->setOpacity(0.7);
  view.show();
  return app.exec();
}

#include <QtGui>                       
#include <QGLWidget>                  

int main(int argc, char **argv){
  QApplication app(argc, argv); 
  QGraphicsView view;           
  QGraphicsScene scene;         
  scene.setBackgroundBrush(Qt::blue);
  view.setScene(&scene);             
  view.setViewport(new QGLWidget);
  QString txt = "Some text";
  QGraphicsTextItem *item = scene.addText(txt);
  QFont f;
  f.setPointSize(36);
  item->setFont(f);
  item->setFlag(QGraphicsItem::ItemIsMovable);
  item->setCacheMode(QGraphicsItem::ItemCoordinateCache);
  QTransform trans;
  trans.rotate(60, Qt::YAxis);
  item->setTransform(trans);
  item->setOpacity(0.7);
  view.show();
  return app.exec();
}

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