QCustomPlot Discussion and Comments

Plotting real time dataReturn to overview

I'm currently working on project which plots 64 graphs. Data previewed on graphs represents data received from medical device. Data is plotted in an ECG style (starting again after few seconds and replacing the previous data).
1. Is it the way to replot only newly coming data from device, without re-plotting already draw graphs data?
2. Is it possible to move this functionality to openGL rendering (we experienced GUI freezes)?

I would create a buffer QPixmap.
I would try to override the QCPGraph::draw(QCPPainter *painter), where I would draw only the last line in this buffer. And at the end of the function would draw this buffer using QCPPainter *painter.