xfce4-session-logout: System hang/slowdown on logout dialog

Submitted by Kristian Angelov

Assigned to Xfce Bug Triage

Link to original bug (#15360)

Description

xfce4-session-logout creates significant slowdown until displaying the dialog. Creating the dialog slows down the entire system for up to 10 seconds before displaying it. Various inputs such as clicking the mouse and pressing keyboard keys sometimes speeds it up tho I'm unsure if related.

Video of this here: https://www.youtube.com/watch?v=7aHFpzjSUmA

Version: 4.12.0