[S]Consequences of installing libs from multiple desktop environments?

Right now I'm using xfce4. But I found myself wanting to install some software that has KDE libraries as its dependencies. In the past I restrained myself and searched of an alternative software that would not pull a whole array of libraries from some other desktop environment. But now I started to think whether or not it would be a bad thing.
E.g. right now I want to install okular. It will pull "kdebase4-runtime" (which will pull "kdelibs4" and so on). I wonder what would be the consequences of installing those libraries, considering that I already use xfce4. In particular I'm interesting in following (and please sorry if those questions are too noobish):
1) Will I actually accidentally install the full k desktop environment by automatically installing all those dependencies and the only way I'll be able to use any software that wants to pull some KDE dependencies is if I actually will use full KDE?
2) Whether those libraries will be "passive" and be used only to support the applications that require them or will they actively slow down the system even if they not used and not being called?
And will there be any other problems or drawbacks if I'll install those dependencies?
Thanks in advance!
Last edited by CoolArchBro (2013-12-19 18:14:12)

CoolArchBro wrote:1) Will I actually accidentally install the full k desktop environment by automatically installing all those dependencies and the only way I'll be able to use any software that wants to pull some KDE dependencies is if I actually will use full KDE?
Accidentally?  No.  Not unless you put on a blindfold and start pecking at the keyboard while running pacman.  If a package does actually require all of KDE as a dependency, then you will either install the full desktop intentionally, or not at all.  In the former case, there will still be no need to "use" KDE.  One can have many desktops installed on the same computer - they don't run by just being installed, you have to invoke them.
CoolArchBro wrote:2) Whether those libraries will be "passive" and be used only to support the applications that require them or will they actively slow down the system even if they not used and not being called?
They'll be as passive as any of the data on your hard drive.  If drive space is at a premium, this might be an issue, but if you are not filling up your drive, then having something installed will have no effect what so ever.
I have a bit of an OCD minimalism: I track down any unused packages and eliminate them - I've even removed several 'base' packages.  But this does absolutely nothing to improve performance on my system, it's more of just a 'hobby' or chance to learn what all the different pieces do.

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