https://bugs.kde.org/show_bug.cgi?id=475468

ratijas <m...@ratijas.tk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDSINFO                   |REPORTED
         Resolution|WAITINGFORINFO              |---

--- Comment #4 from ratijas <m...@ratijas.tk> ---
This is X11. The lag happens on any window resize. Less for Qt Widgets apps,
more for QtQuick apps. Since panels are QtQuick views, and they animate by
interpolating their window size, they lag a lot to the point where it is a
complete slideshow at seconds per frames.

On Wayland window resizing is 60fps smooth for Qt Widgets & QtQuick apps and
Plasma panels.

I think we should be able to detect if animation takes too long to draw a
frame, and when it does — fall back to a different strategy, like changing size
once and animating panel internally, or not animating at all.

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