Bug#837356: libreoffice-gtk3: Impress is unusably slow on GNOME 3 with libreoffice-gtk3 installed

[Stephen Kitt <skitt@debian.org>]

Package: libreoffice-gtk3
Version: 1:5.2.1-1
Severity: important

Dear Maintainer,

This might be related to https://bugs.debian.org/836531 but I'm not
sure. With 5.2.0 and 5.2.1, running on GNOME 3, Impress is unusably
slow if libreoffice-gtk3 is installed. The steps to reproduce on my
system are simply

* start Impress
* open a new document
* click on any "Click to add ..." message
* wait for a couple of minutes before anything happens (with one core
  pegged at 100%)

Every single interaction with the document takes a couple of minutes
to be taken into account, apart from changing slides: typing text,
moving elements around...

Uninstalling libreoffice-gtk3 fixes the problem. Clearing
LibreOffice's configuration doesn't.

Regards,

Stephen


-- System Information:
Debian Release: stretch/sid
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'testing'), (500, 'stable'), (200, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.7.0-1-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages libreoffice-gtk3 depends on:
ii  libatk1.0-0               2.20.0-1
ii  libc6                     2.23-5
ii  libcairo-gobject2         1.14.6-1+b1
ii  libcairo2                 1.14.6-1+b1
ii  libdbus-1-3               1.10.10-1
ii  libdbus-glib-1-2          0.106-1
ii  libgcc1                   1:6.1.1-11
ii  libgdk-pixbuf2.0-0        2.34.0-1
ii  libgl1-mesa-glx [libgl1]  11.2.2-1
pn  libglew1.10               <none>
ii  libglib2.0-0              2.49.6-1
ii  libglu1-mesa [libglu1]    9.0.0-2.1
ii  libgtk-3-0                3.21.5-3
ii  libice6                   2:1.0.9-1+b1
ii  libpango-1.0-0            1.40.2-1
ii  libpangocairo-1.0-0       1.40.2-1
ii  libreoffice-core          1:5.2.1-1
ii  libsm6                    2:1.2.2-1+b1
ii  libstdc++6                6.1.1-11
ii  libx11-6                  2:1.6.3-1
ii  libxext6                  2:1.3.3-1
ii  uno-libs3                 5.2.0-2
ii  ure                       5.2.0-2

Versions of packages libreoffice-gtk3 recommends:
ii  libreoffice-style-tango  1:5.2.1-1

libreoffice-gtk3 suggests no packages.