Ubuntu is also derived from Debian Unstable (except the LTS versions)
Just as the name implies, the only difference between LTS and non-LTS releases of Ubuntu is that for LTS Canonical provides bug fixes, security updates and commercial support for longer term than for non-LTS versions, otherwise both are derived from Debian Unstable in exactly the same way. In other words, difference between two is only in release cadence and support duration, not in the method of production.
Let's wait until March and we are going to see 300 MB of RAM slashed from the KDE memory consumption figures.
About this thread, I installed GNOME to compare and saw some interesting things:
- GNOME gives me no mail notification, Windows 8 notifies me from my main inbox, and KDE notifies me from all my inboxes, all the time.
- If I enable the semantic stuff (Tracker in GNOME, Nepomuk in KDE), enable Empathy and Zeitgeist, I can reach easily 1 GB of RAM with GNOME, while doing a LOT less than KDE.
- The only searcher as capable as KDE's is the searcher built into Windows 8.1.
Well that's the problem, isn't it? I'm just pointing out that bug counts can't be used as a direct measure of software quality. A project with many users will get more bug reports than a less-used project of similar complexity and quality. There are other factors like availability of help and information, ease of writing a bug report and so on but I doubt these are as relevant in this case.