How do I slow the plot of a curve?

bhs67 

I don't think there is any way of controlling the rate at which the chart engine renders a dataset.

That leave you the option of generating partial datasets the control the data available for display.  The Excel 365 TAKE function would truncate a previously calculated dataset for plotting purposes, with the number of points being set manually.  Whether you can achieve what you require in terms of speed and smoothness is another matter.  I do not know whether your chart is to animate over parts of a second or minutes.