Just for future reference.
KDE NEON is a distribution maintained by the kde community so that you can enjoy the latest and greatest kde has to offer on an Ubuntu base.
KDE plasma is a Desktop Environment(DE). It controls the look of your desktop and to some degree how you interact with your computer. You can use kde plasma in almost any distribution. It is somewhat analogous to launchers in android with the caveat that DEs affect a lot of more of the system than launchers do in android.
I have got an old shit laptop and I don't see this. Can you verify this using mangohud¿?