[Bug 1969709] Re: libreoffice font selection unusably slow

[Suppen Kasper]

This font delay problem in libreoffice-writer 7.3/7.4 seems to be a
combination of libreoffice-gtk3 and Nvidia proprietary driver. The
problem appears with default desktop enviroment and with gnome classic.
Problem appears in wayland and xorg.


Ubuntu 22.04
GPU Nvidia 750ti  (Nvidia Driver 515)
Libre Office 7.3/7.4

Extreme Font Menu Delay when:

Nvidia driver - Installed       AND     libreofffice-gtk3
Installed


No Font Menu delay when:

Nvidia driver	Installed	AND	libreofffice-gtk3	Not Installed
Nvidia driver	Not Installed	AND	libreofffice-gtk3	Installed
Nvidia driver	Not Installed	AND	libreofffice-gtk3	Not Installed

I can confirm David White. No problem in Mint 21.
BUT
As soon as i install gnome and log into a gnome session with Mint 21, then the extreme font delay will appear in libre office. When i log back into a mate session then the font menu behaves as it should.

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https://bugs.launchpad.net/bugs/1969709

Title:
  libreoffice font selection unusably slow

Status in fontconfig package in Ubuntu:
  Confirmed
Status in libreoffice package in Ubuntu:
  Confirmed

Bug description:
  Trying to scroll through the font list in the menu bar, I experience
  an unacceptable degree of lagging. Just popping up the dropdown list
  takes 7-10 seconds and the system takes the same amount of time to
  respond to perform individidual scrolling gestures. The CPU jumps to
  100% and the whole system becomes unresponsive.

  I have tried deb, snap and even the packages offered on the site of
  the LibreOffice project. They all manifest the same behaviour. The
  only thing that works is disabling font previews. I have downgraded to
  7.2 for now, which appears to be unaffected.

  I have contacted the LibreOffice team and they tell me that this
  should be solved by fontconfig 2.14. Unfortunately, Ubuntu 22.04 is
  shipping 2.13...

  ProblemType: Bug
  DistroRelease: Ubuntu 22.04
  Package: libreoffice-core 1:7.3.2-0ubuntu2
  ProcVersionSignature: Ubuntu 5.15.0-25.25-generic 5.15.30
  Uname: Linux 5.15.0-25-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu82
  Architecture: amd64
  CasperMD5CheckResult: pass
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Apr 21 05:01:24 2022
  ExecutablePath: /usr/lib/libreoffice/program/soffice.bin
  InstallationDate: Installed on 2022-03-27 (24 days ago)
  InstallationMedia: Ubuntu 22.04 LTS "Jammy Jellyfish" - Alpha amd64 (20220326)
  SourcePackage: libreoffice
  UpgradeStatus: No upgrade log present (probably fresh install)

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