https://bugs.kde.org/show_bug.cgi?id=429196

            Bug ID: 429196
           Summary: kf.plasma.core: findInCache with a lastModified
                    timestamp of 0 is deprecated message makes system
                    lags.
           Product: plasmashell
           Version: 5.20.3
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: k...@davidedmundson.co.uk
          Reporter: aoude...@outlook.com
                CC: plasma-b...@kde.org
  Target Milestone: 1.0
             Flags: X11+

Created attachment 133381
  --> https://bugs.kde.org/attachment.cgi?id=133381&action=edit
plasmashell starting console output

plasmashell starts with too many warning-level debug outputs.

Most notable since Plasma 5.20.x series is:
kf.plasma.core: findInCache with a lastModified timestamp of 0 is deprecated
kf.plasma.core: findInCache with a lastModified timestamp of 0 is deprecated
kf.plasma.core: findInCache with a lastModified timestamp of 0 is deprecated
kf.plasma.core: findInCache with a lastModified timestamp of 0 is deprecated

which is triggered each time the mouse pointer hovers Icon and items in taskbar
panel, like Shortcut to Application pinned in panel, even in
icon-only-taskmanager.

This introduces lags in overall impression.
Added a text file when you trigger "plasmashell --replace &" in a Terminal
(Konsole).

As you can see below, my system is particular fast but as I use a classical
old-like hard-drive (and not a SSD) to my /var partition, I can listen write
access each time my mouse is moved in Plasmashell. That's not a good solution
in the long term.

I could set this environment variable in /etc/environment:
QT_LOGGING_RULES='*=false'

But this not a satisfactory situation.

SOFTWARE/OS VERSIONS
Operating System: Mageia 8
KDE Plasma Version: 5.20.3
KDE Frameworks Version: 5.75.0
Qt Version: 5.15.1
Kernel Version: 5.9.8-desktop-1.mga8
OS Type: 64-bit
Processors: 4 × Intel® Core™ i5-6600K CPU @ 3.50GHz
Memory: 15.6 Gio of RAM
Graphics Processor: GeForce GTX 1660 Ti/PCIe/SSE2

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