Hi,

I using a curve to display up to 2M points or maybe more,

I using Nocurve and using qwtsumbol to represent each point.

myCurve->setStyle(QwtPlotCurve::NoCurve);
myCurve->setSymbol(P_Symbol);

the points are drawn fine and time is good, the problem is when i try to zoom in/out or pan the curve around its really slow,

I using QwtPlotPanner and QwtPlotMagnifier for panning and zooming.

how can i make zooming and panning faster ??

thanks.