Noticeable delay to trigger window overview effect in CPU power save mode

Help
1

Gnome’s overview is smooth even in power save mode. After switch to KDE, the overview delay is every noticeable, its about more than 0.5s delay after trigger it,

  1. Effect animation is not laggy after the delay.
  2. Almost no delay in performance mode
2

It may be worth mentioning distro, version of Plasma, etc., here, because I for one am seeing an instantaneous overview, so it may be linked to the above.

3

kwin 6.5.3, plasma 6.5.3. archlinux btw
Double monitor, iGPU.

CPU usage of kwin_wayland is high at first, and it causes delay. After that, GPU takes effect work.

0
0451×457 23.9 KB

4

I am having the same issue; I am running the following:

Operating System: NixOS 25.11
KDE Plasma Version: 6.5.4
KDE Frameworks Version: 6.20.0
Qt Version: 6.10.1
Kernel Version: 6.18.0 (64-bit)
Graphics Platform: Wayland
Processors: 8 × Intel® Core™ i5-8250U CPU @ 1.60GHz
Memory: 32 GiB of RAM (31,2 GiB usable)
Graphics Processor: Intel® UHD Graphics 620
Manufacturer: LENOVO
Product Name: 20KN001QPB
System Version: ThinkPad E480