tried but didnt work out. Application still slows down.

Can u plz tell how to use QFrameBufferObject inside paint() of QgraphicsItem.

In my application, there is a widget having a QGraphicsScene and a QGraphicsView.
In QGraphicsScene, there are many QGraphicsRectItem. Each QGraphicsRectItem has a QGraphicsItem.
I have set my QGraphicsView viewport as new QGLWidget.

As told earlier, items have different update rate. Any other way of isolating update???