https://bugs.kde.org/show_bug.cgi?id=385955

            Bug ID: 385955
           Summary: X consume a lot of CPU during windows resize
           Product: kwin
           Version: 5.11.0
          Platform: Gentoo Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: kwin-bugs-n...@kde.org
          Reporter: razrfal...@gmail.com
  Target Milestone: ---

Starting from KDE5 windows resizing became a nightmare. Currently, while
resizing the Gwenview window X consume a single CPU core completely leading to
huge lags. GPU usage, according to nvidia-smi is 20-30%.

There are no warnings/errors in /var/log/Xorg.0.log, dmesg,
~/.local/share/sddm/xorg-session.log.

The only custom option is
Option "metamodes" "nvidia-auto-select +0+0 { ForceFullCompositionPipeline = On
}"
in xorg.conf

>From where can I start to investigate performance issues source?

Gentoo Linux stable x86_64, KDE 5.10.5, i5 3570k@3.4, nVidia GTX 960 4GB
(driver 384.90), 1080p monitor.

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