It's my third time testing RQt and like KDE, don't know why but that's the way it is. Both KDE and RQt work superb in Solyd. The reason why I'm here after testing many KDE distros. And the same seems to happen with RQt on SolydX. My main complaint is a non auto-hide panel, but I guess i can live with it. I read it was a work in process before Lxde and Razor-Qt merged.I tried RazorQt twice and gave me the impression of being promising but still too green and needing a good go. And LXDE... too crude for my taste and rather buggy if you ask me. Anyhow, I also have big hopes about LxQt.
I guess it might be made lighter than what I've achieved (all options running in the very same VM system, same services enabled, etc...)
Fluxbox: 202 MB
Openbox: 212 MB
RQt-Openbox: 208 MB
RQt-Kwin: 258 MB
KDE: 406 MB
The spartan OpenBox saves extra 50 Megs over the full featured Kwin. For all the extra functionality Kwin brings, I think it well worths those extra 50. 406 MB for a KDE install is already rather slim at idle. I managed to get it at around 360 some time ago but disabling almost everything but the essentials to keep it running. For those like me never using widgets plasmoids or Dashboard, a minimal single panel including only a systray and the legacy app launcher, and no PIM goodies at all (I gave up Activities too), Plasma is an overkill. Razor makes more sense for getting about the same. Perhaps LXQt too.
I don't care if it takes time. No worries about not getting to LXQt yet (it's still a beta after all). But I'd love to build and try those interesting Qt apps that hushpuppy pointed out.
Any help will be welcome.