Why does my KDE make such a mess when coming back?

I want to do a bunch of tasks before and after the screensaver is activated in KDE (*still* using X11, since Wayland has too many flaws even after 10 years). So I made a custom script that is triggered after 5 minutes of inactivity (KDE settings > Power Management > Other Settings). The problem: when I come back and press a key, KDE takes around 8 seconds to show the desktop, and when it does, it is not quite ready, turns the screen off/on, moves things around, blinks, etc, during around 6 to 8 seconds more until it is finally back from the Dead. Probably that consumes more energy than keeping the screen on! This is my script: #!/bin/bash sleep 2 xset dpms force off If instead of the xset line I put the next line the problem persists: dbus-send --session --print-reply --dest=org.kde.kglobalaccel \ /component/org_kde_powerdevil org.kde.kglobalaccel.Component.invokeShortcut \ string:'Turn Off Screen' So: why is KDE making such a mess, and how can I prevent it? Or maybe there is a better way to do this? I would love to know your own way.