I have been experiencing this issue since I upgraded to Plasma 5.9.

Log (full: https://paste.kde.org/pjuynslk0):

Code: Select all

Feb 21 13:25:47 FredArch systemd[1]: Stopped User Manager for UID 996.
Feb 21 13:25:47 FredArch systemd[1]: Removed slice User Slice of sddm.
Feb 21 13:25:47 FredArch systemd[535]: Started D-Bus User Message Bus.
Feb 21 13:25:51 FredArch ksplashqml[581]: Loading stage  "initial" 3547
Feb 21 13:25:51 FredArch klauncher[608]: Connecting to deprecated signal QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString)
Feb 21 13:25:51 FredArch kdeinit5[615]: Recreating ksycoca file ("/tmp/ksycoca5_en-GB_7MLUta9irdKw_KXiA+s1dMicOmg=", version 303)
Feb 21 13:25:51 FredArch kdeinit5[611]: kf5.kded: No X-KDE-DBus-ServiceName found in "/usr/lib/qt/plugins/kf5/kded/khotkeys.so"
Feb 21 13:25:51 FredArch kdeinit5[611]: kf5.kded: No X-KDE-DBus-ServiceName found in "/usr/lib/qt/plugins/kf5/kded/pointingdevices.so"
Feb 21 13:25:51 FredArch kdeinit5[611]: kf5.kded: No X-KDE-DBus-ServiceName found in "/usr/lib/qt/plugins/kf5/kded/appmenu.so"
Feb 21 13:25:51 FredArch kdeinit5[611]: kf5.kded: No X-KDE-DBus-ServiceName found in "/usr/lib/qt/plugins/kf5/kded/device_automounter.so"
Feb 21 13:25:51 FredArch kdeinit5[611]: kf5.kded: No X-KDE-DBus-ServiceName found in "/usr/lib/qt/plugins/kf5/kded/statusnotifierwatcher.so"
Feb 21 13:25:51 FredArch kdeinit5[611]: kf5.kded: No X-KDE-DBus-ServiceName found in "/usr/lib/qt/plugins/kf5/kded/bluedevil.so"
Feb 21 13:25:51 FredArch kdeinit5[611]: kf5.kded: No X-KDE-DBus-ServiceName found in "/usr/lib/qt/plugins/kf5/kded/freespacenotifier.so"
Feb 21 13:25:51 FredArch kdeinit5[611]: kf5.kded: No X-KDE-DBus-ServiceName found in "/usr/lib/qt/plugins/kf5/kded/ktimezoned.so"
Feb 21 13:25:51 FredArch kdeinit5[611]: kf5.kded: No X-KDE-DBus-ServiceName found in "/usr/lib/qt/plugins/kf5/kded/filenamesearchmodule.so"

It lags for exactly 4 sec every time before "ksplashqml[581]: Loading stage"

I'm using Arch and here're the packages that I installed:

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pacman -Q | egrep "^kde|plasma"
kde-cli-tools 5.9.2-1
kde-gtk-config 5.9.2-1
kde-l10n-ja 16.12.2-1
kde-l10n-zh_cn 16.12.2-1
kde-l10n-zh_tw 16.12.2-1
kdebase-runtime 16.12.2-1
kdeclarative 5.31.0-1
kdecoration 5.9.2-1
kded 5.31.0-1
kdelibs 4.14.29-1
kdelibs4support 5.31.0-1
kdeplasma-addons 5.9.2-1
kdesu 5.31.0-1
plasma-desktop 5.9.2-1
plasma-framework 5.31.0-2
plasma-integration 5.9.2-1
plasma-meta 5.9-1
plasma-nm 5.9.2-1
plasma-pa 5.9.2-1
plasma-sdk 5.9.2-1
plasma-workspace 5.9.2-1
plasma-workspace-wallpapers 5.9.2-1

Any clues, geeks?