Create a line or scatter chart out of many data points (e.g. 3,000). Select a
series: you get one green handle for each point (i.e. 3,000). If you turn on
smooth lines with a resolution of 20 (default), you'll get 60,000 handles.
Obviously, this seems to be too much. The attached example contains a
scatter-plot series with 3,000 data points and smooth lines (splines) switched
on. On Linux I got the impression that the office hangs, on Windows I got the
visual effect that you can see in the attachment.

Maybe we should show one handle per data point as a first step (no handles for
the intermediate points), and then have an upper bound that reduces the handles
to every second, thrird, ... like the auto-label positioning at an axis.

Not sure whether to set this to enhancement or defect, as it seems to be a
defect for extreme examples.