Description:
Starting any component of LibreOffice takes a lot more time than usual, but starting soffice with this extra option takes a normal amount of time:

soffice -env:SAL_USE_VCLPLUGIN=gen 

Which suggests it is an issue which affects GTK3 systems (as I have been told).

Steps to Reproduce:
1. Start a LibreOffice component, for example Writer

Actual Results:
The component takes too long to be operational (about 30 seconds on my computer) and hangs long enough to have "does not respond" dialogues popping up.

Expected Results:
The component opens in a normal amount of time (max 2 seconds on my computer).


Reproducible: Always


User Profile Reset: No



Additional Info:
I started noticing the issue with:

Version: 7.2.0.0.alpha1+ / LibreOffice Community
Build ID: 17694c906f94a195a2d5086e0e87afa1c852107b
CPU threads: 8; OS: Linux 4.15; UI render: default; VCL: gtk3
Locale: en-AU (en_AU.UTF-8); UI: en-US
TinderBox: Linux-rpm_deb-x86_64@86-TDF, Branch:master, Time: 2021-06-09_20:52:06
Calc: threaded

And it was not an issue with a build from just a few days before (not sure which one, sorry), so the change must have happened very recently.