See https://oxyplot.codeplex.com/wikipage?title=Performance&referringTitle=Documentation
Turn off markers, axis grid lines, smoothing. Do not use ItemsSource (binding is slow).
125000 points at 20fps is probably at the limit of what is possible with WPF shapes (I tested the same number of points in the WpfExamples/RealtimeDemo)
Creating a rendering context for WPF using WriteableBitmap or DirectX could be a solution to achieve higher frame rates...
Turn off markers, axis grid lines, smoothing. Do not use ItemsSource (binding is slow).
125000 points at 20fps is probably at the limit of what is possible with WPF shapes (I tested the same number of points in the WpfExamples/RealtimeDemo)
Creating a rendering context for WPF using WriteableBitmap or DirectX could be a solution to achieve higher frame rates...