in reply to intelligent re-sampling of data

Even if I plot only 32000 points, there still are only ~1000 pixels in my screen so Excel does some resampling of its own.

I doubt that Excel is doing any resampling the data. It is probably plotting all the points you supply, even if it means that many pixels are "redrawn" many times as a result of the plotting of the data.

When you shrink or stretch the window in which the chart is drawn, Excel does not go back and resample the data, it simply applies a different final matrix transformation (SetWorldTranform)to the lines and points that make up the chart in order to scale them to the device space alloted.

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