@mire000 can you try this and see what output you get.
Open a terminal, run the command below to quit xfdesktop and relaunch it in debug mode. Keep the terminal window open and visible. Copy a picture to your desktop and then monitor that terminal window for any new entries until the thumbnail appears
Thumbnails are instantaneous my end - sample output on pasting a pic to the desktop.
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DBG[xfdesktop-file-icon-manager.c:2739] xfdesktop_file_icon_manager_file_changed(): got created event
DBG[xfdesktop-file-icon-manager.c:2279] xfdesktop_file_icon_manager_add_icon(): icon '1491x1000_a8242655058386ada167ea82ea4e49ee62f0e48490b29b43d5965caafaf2a253.jpg' didn't have a previous position
DBG[xfdesktop-file-icon-manager.c:2721] xfdesktop_file_icon_manager_file_changed(): got changed event
DBG[xfdesktop-file-icon-manager.c:2721] xfdesktop_file_icon_manager_file_changed(): got changed event
DBG[xfdesktop-icon-view.c:3842] xfdesktop_icon_view_icon_find_position(): old position didn't exist or isn't free, got (5,0) instead
DBG[xfdesktop-thumbnailer.c:566] xfdesktop_thumbnailer_thumbnail_ready_dbus(): thumbnail-ready src: /home/steve/Desktop/1491x1000_a8242655058386ada167ea82ea4e49ee62f0e48490b29b43d5965caafaf2a253.jpg thumbnail: /home/steve/.cache/thumbnails/large/8abddeb5385052ff1cf124dfe15414f0.png
DBG[xfdesktop-file-icon-manager.c:1968] xfdesktop_file_icon_manager_save_icons(): saving to: /home/steve/.config/xfce4/desktop/icons.screen0-1344x703.rc
Also try fixing any home folder file permissions that might be causing an issue
I get the delayed application emblem changes as-well. Looking at the debug output nothing happens for a while and then you get a
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DBG[xfdesktop-file-icon-manager.c:2871] xfdesktop_file_icon_manager_metadata_changed(): metadata file changed event
DBG[xfdesktop-file-icon-manager.c:2871] xfdesktop_file_icon_manager_metadata_changed(): metadata file changed event
I can get the change to take more quickly if I run
touch ~/Desktop/what-ever-the-file-or-folder-name-is
in a terminal immediately after applying the emblem, which changes the modifed date of the file/folder and triggers a desktop refresh but you shouldn't have to do this.
I can't see any relevant bug reports here -
https://bugs.launchpad.net/ubuntu/+source/xfdesktop4 or here
https://bugzilla.xfce.org/buglist.cgi?b ... 2emblem%22