[Solved] Kde desktop very slow loading

The issue started on an upgrade a few months ago. I am patient and I usually have something that has loaded that I can use.
Symptoms:
When: at boot, when I attach hdmi cable, waking from sleep command.
What happens.: already open applications can be used other than multimedia. All widgets including panels can be seen, but can not be toggled. wallpaper does not load. After about 15-20 minutes widgets become usable and wallpaper appears.
Presumption. I have a missing, corrupted or incorrect permission on a configuration maybe kde.desktop?
Once everything is loaded everything I setup and placed works as it should, which I why I really do not want to do a clean install home directory.
I know all this info is in a file somewhere I just do not know what nor where it is and how to fix it so it loads everything right from the beginning.

Did you take a look at your journal during any of those incidents?

$ journalctl -f

Also please see

made an adjustment to get closer to what I needed

Dec 30 04:28:37 bryan-lt audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 subj==unconfined msg='unit=systemd-coredump@75-12207-0 comm="systemd" exe="/>
Dec 30 04:28:37 bryan-lt kdeinit5[12206]: qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
Dec 30 04:28:37 bryan-lt kdeinit5[12206]: This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this>
                                          
                                          Available platform plugins are: wayland-org.kde.kwin.qpa, eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, xcb.
Dec 30 04:28:37 bryan-lt systemd[1]: Started Process Core Dump (PID 12207/UID 0).
Dec 30 04:28:37 bryan-lt systemd-coredump[12208]: Process 12206 (thumbnail.so) of user 1000 dumped core.
                                                  
                                                  Stack trace of thread 12206:
                                                  #0  0x00007f7039738f25 raise (libc.so.6)
                                                  #1  0x00007f7039722897 abort (libc.so.6)
                                                  #2  0x00007f703995296c _ZNK14QMessageLogger5fatalEPKcz (libQt5Core.so.5)
                                                  #3  0x00007f7039f28955 _ZN22QGuiApplicationPrivate25createPlatformIntegrationEv (libQt5Gui.so.5)
                                                  #4  0x00007f7039f28df1 _ZN22QGuiApplicationPrivate21createEventDispatcherEv (libQt5Gui.so.5)
                                                  #5  0x00007f7039b6f1e5 _ZN23QCoreApplicationPrivate4initEv (libQt5Core.so.5)
                                                  #6  0x00007f7039f2bea0 _ZN22QGuiApplicationPrivate4initEv (libQt5Gui.so.5)
                                                  #7  0x00007f7038d0feda _ZN19QApplicationPrivate4initEv (libQt5Widgets.so.5)
                                                  #8  0x00007f703a6f521a kdemain (thumbnail.so)
                                                  #9  0x0000561520e9c293 n/a (kdeinit5)
                                                  #10 0x0000561520e9d3ba n/a (kdeinit5)
                                                  #11 0x0000561520e9dd2e n/a (kdeinit5)
                                                  #12 0x0000561520e98b5c n/a (kdeinit5)
                                                  #13 0x00007f7039724153 __libc_start_main (libc.so.6)
                                                  #14 0x0000561520e9981e n/a (kdeinit5)
Dec 30 04:28:38 bryan-lt kernel: audit: type=1131 audit(1577698117.927:1092): pid=1 uid=0 auid=4294967295 ses=4294967295 subj==unconfined msg='unit=systemd-coredump@75->
Dec 30 04:28:37 bryan-lt audit[1]: SERVICE_STOP pid=1 uid=0 auid=4294967295 ses=4294967295 subj==unconfined msg='unit=systemd-coredump@75-12207-0 comm="systemd" exe="/u>
Dec 30 04:28:37 bryan-lt systemd[1]: systemd-coredump@75-12207-0.service: Succeeded.
Dec 30 04:28:39 bryan-lt kdeinit5[12219]: qt.qpa.xcb: could not connect to display :0
Dec 30 04:28:39 bryan-lt kernel: audit: type=1701 audit(1577698119.184:1093): auid=1000 uid=1000 gid=1001 ses=4 subj==unconfined pid=12219 comm="thumbnail.so" exe="/usr>
Dec 30 04:28:39 bryan-lt kernel: audit: type=1130 audit(1577698119.207:1094): pid=1 uid=0 auid=4294967295 ses=4294967295 subj==unconfined msg='unit=systemd-coredump@76->
Dec 30 04:28:39 bryan-lt audit[12219]: ANOM_ABEND auid=1000 uid=1000 gid=1001 ses=4 subj==unconfined pid=12219 comm="thumbnail.so" exe="/usr/bin/kdeinit5" sig=6 res=1
Dec 30 04:28:39 bryan-lt audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 subj==unconfined msg='unit=systemd-coredump@76-12220-0 comm="systemd" exe="/>
Dec 30 04:28:39 bryan-lt kdeinit5[12219]: qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
Dec 30 04:28:39 bryan-lt kdeinit5[12219]: This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this>
Dec 30 04:22:38 bryan-lt kwin_x11[30314]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 63162, resource id: 49082165, major code: 14 (GetGeometry), >
Dec 30 04:22:59 bryan-lt org_kde_powerdevil[30435]: powerdevil: Can't contact ck
Dec 30 04:22:59 bryan-lt org_kde_powerdevil[30435]: powerdevil: Currently using activity  "b064bca9-c706-47d6-b30c-62464bb6fcfa"
Dec 30 04:22:59 bryan-lt org_kde_powerdevil[30435]: powerdevil: () ()
Dec 30 04:22:59 bryan-lt org_kde_powerdevil[30435]: powerdevil: () ()
Dec 30 04:22:59 bryan-lt org_kde_powerdevil[30435]: powerdevil: Loading profile for plugged AC
Dec 30 04:22:59 bryan-lt org_kde_powerdevil[30435]: powerdevil: Activity is not forcing a profile
Dec 30 04:22:59 bryan-lt org_kde_powerdevil[30435]: powerdevil: Skipping action reload routine as profile has not changed
Dec 30 04:22:59 bryan-lt gmenudbusmenuproxy[30339]: kde.dbusmenuproxy: Ignoring window 37762968 of type -1
Dec 30 04:22:59 bryan-lt kwin_x11[30314]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 6020, resource id: 0, major code: 14 (GetGeometry), minor co>
Dec 30 04:22:59 bryan-lt kwin_x11[30314]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 6021, resource id: 0, major code: 14 (GetGeometry), minor co>
Dec 30 04:22:59 bryan-lt kwin_x11[30314]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 6022, resource id: 0, major code: 14 (GetGeometry), minor co>
Dec 30 04:22:59 bryan-lt kwin_x11[30314]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 6023, resource id: 0, major code: 14 (GetGeometry), minor co>
Dec 30 04:22:59 bryan-lt kwin_x11[30314]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 6024, resource id: 0, major code: 14 (GetGeometry), minor co>
Dec 30 04:22:59 bryan-lt kwin_x11[30314]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 6025, resource id: 0, major code: 14 (GetGeometry), minor co>
Dec 30 04:22:59 bryan-lt kwin_x11[30314]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 6026, resource id: 0, major code: 14 (GetGeometry), minor co>
Dec 30 04:22:59 bryan-lt kwin_x11[30314]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 6027, resource id: 0, major code: 14 (GetGeometry), minor co>
Dec 30 04:23:01 bryan-lt kwin_x11[30314]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 6899, resource id: 0, major code: 14 (GetGeometry), minor co>
Dec 30 04:23:01 bryan-lt kwin_x11[30314]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 6900, resource id: 0, major code: 14 (GetGeometry), minor co>
Dec 30 04:23:01 bryan-lt kwin_x11[30314]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 6901, resource id: 0, major code: 14 (GetGeometry), minor co>
Dec 30 04:23:01 bryan-lt kwin_x11[30314]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 6902, resource id: 0, major code: 14 (GetGeometry), minor co>
Dec 30 04:23:01 bryan-lt kwin_x11[30314]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 6903, resource id: 0, major code: 14 (GetGeometry), minor co>
Dec 30 04:23:01 bryan-lt kwin_x11[30314]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 6904, resource id: 0, major code: 14 (GetGeometry), minor co>
Dec 30 04:23:01 bryan-lt kwin_x11[30314]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 6905, resource id: 0, major code: 14 (GetGeometry), minor co>
Dec 30 04:23:01 bryan-lt kwin_x11[30314]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 6906, resource id: 0, major code: 14 (GetGeometry), minor co>
Dec 30 04:23:01 bryan-lt gmenudbusmenuproxy[30339]: kde.dbusmenuproxy: Ignoring window 37762984 of type -1
Dec 30 04:23:31 bryan-lt kwin_x11[30314]: qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 19963, resource id: 49082493, major code: 3 (GetWindowAttribut>
Dec 30 04:23:31 bryan-lt kwin_x11[30314]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 19964, resource id: 49082493, major code: 14 (GetGeometry), >
Dec 30 04:23:51 bryan-lt FAHClient[19903]: 09:23:51:WU00:FS00:0xa7:Completed 28750 out of 125000 steps (23%)
Dec 30 04:24:12 bryan-lt kwin_x11[30314]: qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 32414, resource id: 49086645, major code: 3 (GetWindowAttribut>
Dec 30 04:24:12 bryan-lt kwin_x11[30314]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 32415, resource id: 49086645, major code: 14 (GetGeometry), >
Dec 30 04:26:59 bryan-lt kwin_x11[30314]: qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 42768, resource id: 49088018, major code: 3 (GetWindowAttribut>
Dec 30 04:26:59 bryan-lt kwin_x11[30314]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 42769, resource id: 49088018, major code: 14 (GetGeometry), >
Dec 30 04:28:36 bryan-lt vlc[11028]: kf5.kio.kdirmodel: No node found for item that was just removed: QUrl("file:///Videos/ZZTXT Files/000help")
Dec 30 04:28:36 bryan-lt gmenudbusmenuproxy[30339]: kde.dbusmenuproxy: Ignoring window 6303921 of type 5
Dec 30 04:28:36 bryan-lt kdeinit5[12205]: kf5.kio.kio_tags: tag fetch failed: "Failed to open the database"
Dec 30 04:28:36 bryan-lt kdeinit5[12205]: kf5.kio.kio_tags: "tags:/" list() invalid url
Dec 30 04:28:37 bryan-lt kdeinit5[12206]: qt.qpa.xcb: could not connect to display :0
Dec 30 04:28:37 bryan-lt kernel: audit: type=1701 audit(1577698117.077:1090): auid=1000 uid=1000 gid=1001 ses=4 subj==unconfined pid=12206 comm="thumbnail.so" exe="/usr>
Dec 30 04:28:37 bryan-lt kernel: audit: type=1130 audit(1577698117.117:1091): pid=1 uid=0 auid=4294967295 ses=4294967295 subj==unconfined msg='unit=systemd-coredump@75->
Dec 30 04:28:37 bryan-lt audit[12206]: ANOM_ABEND auid=1000 uid=1000 gid=1001 ses=4 subj==unconfined pid=12206 comm="thumbnail.so" exe="/usr/bin/kdeinit5" sig=6 res=1
Dec 30 04:28:37 bryan-lt audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 subj==unconfined msg='unit=systemd-coredump@75-12207-0 comm="systemd" exe="/>
Dec 30 04:28:37 bryan-lt kdeinit5[12206]: qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
Dec 30 04:28:37 bryan-lt kdeinit5[12206]: This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this>
                                          
                                          Available platform plugins are: wayland-org.kde.kwin.qpa, eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, xcb.
Dec 30 04:28:37 bryan-lt systemd[1]: Started Process Core Dump (PID 12207/UID 0).
Dec 30 04:28:37 bryan-lt systemd-coredump[12208]: Process 12206 (thumbnail.so) of user 1000 dumped core.
                                                  
                                                  Stack trace of thread 12206:
                                                  #0  0x00007f7039738f25 raise (libc.so.6)
                                                  #1  0x00007f7039722897 abort (libc.so.6)
                                                  #2  0x00007f703995296c _ZNK14QMessageLogger5fatalEPKcz (libQt5Core.so.5)
                                                  #3  0x00007f7039f28955 _ZN22QGuiApplicationPrivate25createPlatformIntegrationEv (libQt5Gui.so.5)
                                                  #4  0x00007f7039f28df1 _ZN22QGuiApplicationPrivate21createEventDispatcherEv (libQt5Gui.so.5)
                                                  #5  0x00007f7039b6f1e5 _ZN23QCoreApplicationPrivate4initEv (libQt5Core.so.5)
                                                  #6  0x00007f7039f2bea0 _ZN22QGuiApplicationPrivate4initEv (libQt5Gui.so.5)
                                                  #7  0x00007f7038d0feda _ZN19QApplicationPrivate4initEv (libQt5Widgets.so.5)
                                                  #8  0x00007f703a6f521a kdemain (thumbnail.so)
                                                  #9  0x0000561520e9c293 n/a (kdeinit5)
                                                  #10 0x0000561520e9d3ba n/a (kdeinit5)
                                                  #11 0x0000561520e9dd2e n/a (kdeinit5)
                                                  #12 0x0000561520e98b5c n/a (kdeinit5)
                                                  #13 0x00007f7039724153 __libc_start_main (libc.so.6)
                                                  #14 0x0000561520e9981e n/a (kdeinit5)
Dec 30 04:28:38 bryan-lt kernel: audit: type=1131 audit(1577698117.927:1092): pid=1 uid=0 auid=4294967295 ses=4294967295 subj==unconfined msg='unit=systemd-coredump@75->
Dec 30 04:28:37 bryan-lt audit[1]: SERVICE_STOP pid=1 uid=0 auid=4294967295 ses=4294967295 subj==unconfined msg='unit=systemd-coredump@75-12207-0 comm="systemd" exe="/u>
Dec 30 04:28:37 bryan-lt systemd[1]: systemd-coredump@75-12207-0.service: Succeeded.
Dec 30 04:28:39 bryan-lt kdeinit5[12219]: qt.qpa.xcb: could not connect to display :0
Dec 30 04:28:39 bryan-lt kernel: audit: type=1701 audit(1577698119.184:1093): auid=1000 uid=1000 gid=1001 ses=4 subj==unconfined pid=12219 comm="thumbnail.so" exe="/usr>
Dec 30 04:28:39 bryan-lt kernel: audit: type=1130 audit(1577698119.207:1094): pid=1 uid=0 auid=4294967295 ses=4294967295 subj==unconfined msg='unit=systemd-coredump@76->
Dec 30 04:28:39 bryan-lt audit[12219]: ANOM_ABEND auid=1000 uid=1000 gid=1001 ses=4 subj==unconfined pid=12219 comm="thumbnail.so" exe="/usr/bin/kdeinit5" sig=6 res=1
Dec 30 04:28:39 bryan-lt audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 subj==unconfined msg='unit=systemd-coredump@76-12220-0 comm="systemd" exe="/>
Dec 30 04:28:39 bryan-lt kdeinit5[12219]: qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
Dec 30 04:28:39 bryan-lt kdeinit5[12219]: This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this>
                                          
                                                  #12 0x0000561520e98b5c n/a (kdeinit5)
                                                  #13 0x00007f7039724153 __libc_start_main (libc.so.6)
                                                  #14 0x0000561520e9981e n/a (kdeinit5)
Dec 30 04:28:38 bryan-lt kernel: audit: type=1131 audit(1577698117.927:1092): pid=1 uid=0 auid=4294967295 ses=4294967295 subj==unconfined msg='unit=systemd-coredump@75->
Dec 30 04:28:37 bryan-lt audit[1]: SERVICE_STOP pid=1 uid=0 auid=4294967295 ses=4294967295 subj==unconfined msg='unit=systemd-coredump@75-12207-0 comm="systemd" exe="/u>
Dec 30 04:28:37 bryan-lt systemd[1]: systemd-coredump@75-12207-0.service: Succeeded.
Dec 30 04:28:39 bryan-lt kdeinit5[12219]: qt.qpa.xcb: could not connect to display :0
Dec 30 04:28:39 bryan-lt kernel: audit: type=1701 audit(1577698119.184:1093): auid=1000 uid=1000 gid=1001 ses=4 subj==unconfined pid=12219 comm="thumbnail.so" exe="/usr>
Dec 30 04:28:39 bryan-lt kernel: audit: type=1130 audit(1577698119.207:1094): pid=1 uid=0 auid=4294967295 ses=4294967295 subj==unconfined msg='unit=systemd-coredump@76->
Dec 30 04:28:39 bryan-lt audit[12219]: ANOM_ABEND auid=1000 uid=1000 gid=1001 ses=4 subj==unconfined pid=12219 comm="thumbnail.so" exe="/usr/bin/kdeinit5" sig=6 res=1
Dec 30 04:28:39 bryan-lt audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 subj==unconfined msg='unit=systemd-coredump@76-12220-0 comm="systemd" exe="/>
Dec 30 04:28:39 bryan-lt kdeinit5[12219]: qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
Dec 30 04:28:39 bryan-lt kdeinit5[12219]: This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this>
                                          
                                          Available platform plugins are: wayland-org.kde.kwin.qpa, eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, xcb.
Dec 30 04:28:39 bryan-lt systemd[1]: Started Process Core Dump (PID 12220/UID 0).
Dec 30 04:28:39 bryan-lt systemd-coredump[12221]: Process 12219 (thumbnail.so) of user 1000 dumped core.
                                                  
                                                  Stack trace of thread 12219:
                                                  #0  0x00007f7039738f25 raise (libc.so.6)
                                                  #1  0x00007f7039722897 abort (libc.so.6)
                                                  #2  0x00007f703995296c _ZNK14QMessageLogger5fatalEPKcz (libQt5Core.so.5)
                                                  #3  0x00007f7039f28955 _ZN22QGuiApplicationPrivate25createPlatformIntegrationEv (libQt5Gui.so.5)
                                                  #4  0x00007f7039f28df1 _ZN22QGuiApplicationPrivate21createEventDispatcherEv (libQt5Gui.so.5)
                                                  #5  0x00007f7039b6f1e5 _ZN23QCoreApplicationPrivate4initEv (libQt5Core.so.5)
                                                  #6  0x00007f7039f2bea0 _ZN22QGuiApplicationPrivate4initEv (libQt5Gui.so.5)
                                                  #7  0x00007f7038d0feda _ZN19QApplicationPrivate4initEv (libQt5Widgets.so.5)
                                                  #8  0x00007f703a6f521a kdemain (thumbnail.so)
                                                  #9  0x0000561520e9c293 n/a (kdeinit5)
                                                  #10 0x0000561520e9d3ba n/a (kdeinit5)
                                                  #11 0x0000561520e9dd2e n/a (kdeinit5)
                                                  #12 0x0000561520e98b5c n/a (kdeinit5)
                                                  #13 0x00007f7039724153 __libc_start_main (libc.so.6)
                                                  #14 0x0000561520e9981e n/a (kdeinit5)
Dec 30 04:28:39 bryan-lt kernel: audit: type=1131 audit(1577698119.754:1095): pid=1 uid=0 auid=4294967295 ses=4294967295 subj==unconfined msg='unit=systemd-coredump@76->
Dec 30 04:28:39 bryan-lt audit[1]: SERVICE_STOP pid=1 uid=0 auid=4294967295 ses=4294967295 subj==unconfined msg='unit=systemd-coredump@76-12220-0 comm="systemd" exe="/u>
Dec 30 04:28:39 bryan-lt systemd[1]: systemd-coredump@76-12220-0.service: Succeeded.
Dec 30 04:28:41 bryan-lt kdeinit5[12232]: qt.qpa.xcb: could not connect to display :0

Fixed. Went to Desktop settings. looked into wallpaper. For layout toggled desktop and up came a message (that I can not remember exact wording as I can not recreate and have had health issues interrupting me) that I needed hit the apply button to use it. I also needed to follow the same procedure with the desktop on the HDMI. Once that was done. I rebooted and everything works crisp and fast. Obvious a config file was either missing or not correctly configured and that fix everything.

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