https://bugs.kde.org/show_bug.cgi?id=450248
Bug ID: 450248
Summary: [Wayland] Displaying the window thumbnail in Task
Manager is very lazy and causes lag in the entire
desktop
Product: plasmashell
Version: master
Platform: openSUSE RPMs
OS: Linux
Status: REPORTED
Keywords: wayland
Severity: normal
Priority: NOR
Component: Task Manager and Icons-Only Task Manager
Assignee: plasma-b...@kde.org
Reporter: behzad.a...@hotmail.com
Target Milestone: 1.0
As you can see in these videos, displaying window thumbnails takes a long time
and almost utilizes a bit high CPU, and causes lag in the entire desktop; If
you pay attention to the movement of the mouse cursor(First video) and how to
play the video(Second video), you can see the lag clearly, Also as you can see
at the end of the second video, this problem occurs only in Task Manager(Only
in Wayland session) and "Window switching" effect works fine.
This problem may not be detectable on powerful systems, but it is very annoying
in old and low-end systems like my old laptop.
Video 1: https://youtu.be/Vx8WeRMudso
Video 2: https://youtu.be/gP3QTwwPxdU
System: Host: localhost.localdomain Kernel: 5.16.4-1-default x86_64 bits: 64
compiler: gcc v: 11.2.1
Desktop: KDE Plasma 5.24.80 tk: Qt 5.15.2 wm: kwin_wayland dm: SDDM
Distro: openSUSE Tumbleweed 20220206
CPU: Info: Dual Core model: Intel Core2 Duo T6670 bits: 64 type: MCP
arch: Penryn rev: A cache: L2: 2 MiB
flags: lm nx pae sse sse2 sse3 sse4_1 ssse3 vmx bogomips: 8771
Speed: 1215 MHz min/max: 1200/2201 MHz boost: enabled Core speeds
(MHz): 1: 1215 2: 1552
Graphics: Device-1: Intel Mobile 4 Series Integrated Graphics vendor: Sony
driver: i915 v: kernel bus-ID: 00:02.0
chip-ID: 8086:2a42
Device-2: Ricoh Sony Vaio Integrated Webcam type: USB driver:
uvcvideo bus-ID: 2-2:2 chip-ID: 05ca:18b3
Display: wayland server: SUSE LINUX 1.21.1.3 compositor:
kwin_wayland driver: loaded: modesetting
unloaded: fbdev,vesa alternate: intel resolution: 1280x800~60Hz
s-dpi: 96
OpenGL: renderer: Mesa Mobile Intel GM45 Express (CTG) v: 2.1 Mesa
22.1.0-devel-git-e2cd0c3a direct render: Yes
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