[Qt-interest] Drawing huge amounts of data into a waterfall

[Valentina Masi]

Hi all

I am developing an application drawing a huge amount of data: every 250ms my application receives a new array of 2731 floats and has to update a waterfall chart moving down the chart content of 1 pixel and showing a new line (of 2731 points) at the top of the chart.
In order to do this, I have created a custom widget extending QWidget and overridden paintEvent handler. My problem is that running my application is too selfish in term of CPU and gets very slow just after a few seconds.

Can anyone give me a suggest?

Thanks in advance 
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