The latest version of KDE (past year or so) uses approximately the same "freshly launched" size as XFCE does and is as snappy as anything else on a relatively modern system (when compared to Gnome3 and XFCE). I think the main reason to pick XFCE is the interface and overall stability not because it's lighter than KDE any longer.
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The latest version of KDE (past year or so) uses approximately the same "freshly launched" size as XFCE does and is as snappy as anything else on a relatively modern system (when compared to Gnome3 and XFCE). I think the main reason to pick XFCE is the interface and overall stability not because it's lighter than KDE any longer.