[Libreoffice-bugs] [Bug 139220] Selection of imported elements very slow

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=139220

--- Comment #3 from lj618 at pobox.com ---
Confirmed.

It isn't specific to imported PDFs. You can duplicate the problem like this:
Draw a small object like a filled ellipse. Select, use Duplicate to make 15
copies at a small offset. Now select all 16, copy, click off them, paste, move.
Repeat, doubling each time.

Here are the times I get to select N ellipses on 2 different PCs running older
and more recent LibreOffice. Note that PC #2 is much faster than #1 in general.

#1) Pentium-M, LibreOffice-6.2.8 32-bit on 32-bit Linux, Gtk2
# objects:   seconds to select:
  32           <1
  64           <1
 128           <1
 256           <1
 512           1
1024           2

#2) Core-2, LibreOffice-6.4.6 64-bit on 64-bit Linux, Gtk3
# objects:   seconds to select:
  32           <1
  64           <1 
 128           1
 256           3
 512          17
1024         128

I think I would call this a non-linear performance regression.

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