https://bugs.kde.org/show_bug.cgi?id=456038

            Bug ID: 456038
           Summary: Accent Colour detection done unnecessarily when the
                    sync is disabled / for non primary screens.
           Product: plasmashell
           Version: master
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Image Wallpaper
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected], [email protected]
  Target Milestone: 1.0

Kirigami.ImageColors is super expensive. It has to render the wallpaper twice
into an offscreen texture, resize that, then go through pixels.

On my regular desktop machine over 3.5% of all startup, albeit some offloaded
in another thread. That's fine when it's used. It's silly to do this when the
feature is disabled / for non-primary screens and we throw the result away.

Could we have a think about some ideas for that.

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