Unfortunately if any of the three features is enabled (tooltips, point marks, labels), RadChart will still generate a separate transparent visual for each data point that is used for interactivity handling and this will add significant performance hit in scenarios where large number of data points are displayed.
Alternatively, you can enable the data sampling
feature of RadChart (the default threshold value is 200 but can be modified via the SamplingSettings.SamplingThreshold property).
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