[Octave-bug-tracker] [bug #31305] slow contour plot

[Konstantinos Poulios]

Follow-up Comment #42, bug #31305 (project octave):

In that changeset, in order to fix some other bug, I had enabled the
calculation of label positions even for empty labels. This means that if we
test the performance on a plot with nonempty labels the performance with or
without this changeset should be similar.

If the contour plot involves some long iteration, maybe a more general
solution would be to disable all costly callbacks at the beginning and
re-enable them when the contour loops are finished. I am not familiar with the
contour code but these are my first thoughts on this issue.

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