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Try plotting a 2x10000 range in libreoffice. Takes > 2 Mon just to render the graph. I'd be happy to provide the CSV to anyone interested

I've found the speed relates to the fileformat it is saved in. Might well still be slower, but in terms of speed ods > xls > xlsx for some reason.

I had it slow with plain CSV...

Plain CSV is ‘slower’ for whatever reason in my experience.

(I have no idea how other formats are structured)

I know this is impertinent, but can you lodge a bug with the project?