Details
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Bug
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Resolution: Unresolved
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P3: Somewhat important
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None
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5.12.3
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None
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Mac OS 10.13.6, 2,4 GHz Intel Core i5, 16GB RAM
Mac OS 10.13.6, 2,8 GHz Intel Core i7 12GB RAM
Windows 10, intel i7-8700 3.7GHz, 32GB RAM
CentOS 7, intel i7-8700 3.7GHz, 8GB RAM
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Linux/X11,
macOS,
Windows
Description
Hello,
I'm experiencing strong performance issue on real-time plot using QCharts. I'm using 3 QChart within a mainwindow plotting data streamed from another thread. Data are streamed at 250Hz.
To get the mainwindow not freezed in release mode I have to set the refresh rate of the charts to about 10Hz. In debug the situation is even worse. The refresh rate should be about 3Hz to have a responsive GUI.
Points are added creating a QVector<QPointF> and then replace the entire vector into the QLineSeries, as suggested within the QLineSeries documentation.
Before that, I was using QCustomplot and everything worked fine without any performance issue. I have also profiled the code execution using Instruments and most of the main thread time is spent in the following function:
QtCharts::QValueAxisPrivate::setRange(double, double)
It is normal?
Since the moment I have moved from QCustomplot to QChart I'm not able to run the program in debug mode. I must run it in Profile adding debug symbols.