If KDE Plasma becomes slow and irresponsive when you save a file for example, then it's because QtProject.conf is corrupt and you must remove it.
Type this command on a terminal :
rm ~/.config/QtProject.conf
If KDE Plasma becomes slow and irresponsive when you save a file for example, then it's because QtProject.conf is corrupt and you must remove it.
Type this command on a terminal :
rm ~/.config/QtProject.conf