I am quite new to your forums and wanted to say hello to everyone. I'm asking if some of you gals/guys experience it too to check whether it's a general or configuration or KDE related issue ? (Breeze GTK ? Kwin ? Some anti-tearing workaround side-effect ? NVIDIA ?

Some better information about your system might be useful (see my signature as an example what is useful) and an exact description of your problem, your question is too vague to be answered.