> So, I would expect that the real graphic part is not what is costing
> time here. Time is lost elsewhere.
>

Correct. The rendering part has already been optimized in JBT by using
FastXYChart. Effectively, no matter how large the data set is, the
rendering time will be about the same, which is about 2 seconds on my
machine. If you use a standard JFreeChart library, it would be minutes
and hours to render such quantities of data.  However, JBT still loads
all these millions of data points into JFreeChart structures, on the
initial pass. This is where all the time is spent.

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