I know kubuntu was community, and I thought lubuntu and xubuntu were as well.
It certainly seems like Ubuntu is trying to make itself synonymous with Unity.
BTW, does it seem strange that kwin is faster than lubuntu? I don't recall the Wm they use but I'm fairly certain that it doesn't support composition.
Similarly, it looks as if mutter isnt always correctly detecting fullscreen windows and then unredirecting.