Hi,

I have a QGraphicScene with 200 items and it is very slow when scrolling or moving the items !!!!

I setup my QGraphicsView this way :

Qt Code: 
  1. QNodesView::QNodesView(QWidget* parent)
  2. :QGraphicsView(parent), _zoomLevel(0), _zoomValue(1.0f)
  3. {
  4.     setRenderHint(QPainter::Antialiasing, true);
  5.  
  6. 	setBackgroundBrush(QImage(":/pureStudio/Images/pgEditorBG.png"));
  7. 	setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform);
  8.  
  9. 	// Multi-selection
  10. 	setDragMode(QGraphicsView::RubberBandDrag);
  11. 	// NoDrag, ScrollHandDrag, RubberBandDrag 
  12.  
  13. 	// Optimization
  14. 	setOptimizationFlags(QGraphicsView::DontClipPainter);
  15. 	setOptimizationFlags(QGraphicsView::DontSavePainterState);
  16. 	setOptimizationFlags(QGraphicsView::DontAdjustForAntialiasing);
  17. 	setCacheMode(QGraphicsView::CacheBackground);
  18.  
  19. 	// Drag & drop
  20. 	setAcceptDrops(true);
  21. }
To copy to clipboard, switch view to plain text mode