RAM/resource usage has been steadily decreasing for Plasma for a while, and has basically reached XFCE levels, so I suspect your information may be out of date.

RAM/resource usage has been steadily decreasing for Plasma for a while, and has basically reached XFCE levels, so I suspect your information may be out of date. On my system it's currently using 250MB. Xubuntu is a great DE recommendation, though.