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Created Unassigned: Poor live data performance [10134]

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Based on [this article](https://oxyplot.codeplex.com/discussions/281036) I'm using PlotModel.RefreshPlot(true) frequently to load live data, approximately 20 times per second or so, but the performance is not good. It is sluggish and lags behind.

I have 8 line series with 1000 samples/sec each, but reducing the data frequency does not seem to help much, so this does not seem directly related to drawing performance.

There are a few issues:
* RefreshPlot(true) seems to queue on the GUI thread, probably with BeginInvoke, so that if it runs sluggishly it will also start lagging behind with several seconds in a short time.
* RefreshPlot generally feels very slow for a live data scenario
* The GUI thread is locked for big chunks of the time, so even moving the parent window is very sluggish

I am on a powerful PC with pretty recent CPU and GPU, so that should not be the problem. Running Windows 8, but same is seen on Win7.

I have not yet dug into the source code of Oxyplot, but are there any tips on how to improve live data rendering?

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