Zoom and scroll (pyqt5 -python)

[d_stranz]

Thanks, I'll try!

Another thing you can try: If the line plot is fast, then think about drawing only a line plot during zooming or scrolling. That is, when scrolling starts, replace the candle plot series with a line series and update that. When scrolling stops, replace the line series with the candle series again. You can use the QTimer trick to know when scrolling has stopped. You will give the impression of real time scrolling, but you will have only a small fraction of the things to draw.

I don't think users will care if the candles disappear during scrolling. Many graphics software apps reduce the level of detail during interactive procedures to get better performance. As soon as scrolling stops, the full plot will reappear.