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[Octave-bug-tracker] [bug #55908] Closing plots much slower in Octave 5.

From: Rik
Subject: [Octave-bug-tracker] [bug #55908] Closing plots much slower in Octave 5.1.0
Date: Wed, 13 Mar 2019 16:38:18 -0400 (EDT)
User-agent: Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; rv:11.0) like Gecko

Update of bug #55908 (project octave):

                 Summary: Closing 2D plots much slower in Octave 5.1.0 =>
Closing plots much slower in Octave 5.1.0


Follow-up Comment #2:

I think that a small delay may have been introduced in the deletion of
graphics objects to work around cross-thread issues between the GUI and the
main interpreter thread.  But that might be completely off.

In any case, this happens for both 2-D and 3-D plots so I have changed the
Summary to reflect that.

For the 2-D case, I used

hl = plot (rand (2, 1000));
tic; close; toc

For version 4.4.1 this takes 60 milliseconds, but 340 milliseconds with 5.1.0.
 That is approximately a factor of 5 slowdown.  That isn't as bad as the
reporter's 60X slowdown for a 3-D scene, but still bad.


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