There is no magic language or library that is magically faster than others.
Quote:
I need an advice.
I would like to show data as an line diagramm. The most important feature is speed.
The word 'Speed' alone means nothing.
How fast do you need the drawing to be ? (in seconds)
What is the size of data to plot ? (how many points to plot)
As of today, the hardware is fast, but if you want to plot 10M points, expect some delay.