Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: at-spi2-atk (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1584795
Title:
Severe lag in LibreOffice Draw due to /etc/X11/Xsession.d/90atk-
adaptor
Status in at-spi2-atk package in Ubuntu:
Confirmed
Bug description:
On Ubuntu 16.04, I found that LibreOffice Draw (4.2.x, 5.0.x, 5.1.x
versions) was extremely slow when selecting and moving a bunch of
shapes in some relatively simple drawings. This occurred on five
Ubuntu boxes I have. However, there was no slow down on Windows with
the same files and also on a fresh install of Xubuntu 16.04 in a
virtual machine.
After a long investigation, I finally found the culprit: for some
reason, the package gnome-orca was installed on my machines and this
package pulls down the libatk-adaptor package, which in turn installs
the file /etc/X11/Xsession.d/90atk-adaptor.
I found that removing that file solves the problem and now LibreOffice
Draw is fully responsive. Perhaps other graphic applications could
suffer from the same problem, but I was not able to see some huge lag
as in LO Draw.
To reproduce:
1. install libatk-adaptor (version 2.18.1-2ubuntu1:amd64 of Ubuntu 16.04) or
simply the gnome-orca package
2. open the attached file test.odg with LibreOffice Draw, and select a
bunch of shapes (for example, the two axes and shapes of the page
bottom). Then, try to move the selected shapes with the keyboard
(shift + arrow) and you should see a severe lag. If you maintain the
key pressed during the move, then the UI is blocked during some time.
Moving the shapes using the mouse is faster but still quite slow as
compared to the expected performance.
3. remove the file /etc/X11/Xsession.d/90atk-adaptor and restart X
4. open again the test.odg file. Now, moving a bunch of shapes using
the keyboard (or the mouse) is very smooth and fluid, as it should be.
This is 100% reproducible on all the machines I have where the libatk-
adaptor package is installed.
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