linuxmemes

Which features are unnecessary?

Well, depends how you're using it. In my case, for example, I don't have a printer, so I could turn off the entire print manager system/service and save a bit of unnecessary RAM. And if you're trying to be economical about RAM usage, things like fancy window decorations, window animations, and other purely aesthetic stuff like that can of course go. But, really, what features are necessary versus unnecessary will depend on you and what you're using your computer for.

Or did you just mean what features does KDE have?

In that case, the answer is basically, all the features. Like, KDE is the quintessential 'everything and the kitchen sink' desktop. You name it, they have it ... or it can quickly and easily be added. Any feature you can think of from any other OS or desktop, chances are KDE already has it or at least can do it with just a little tweaking.

For an example, I think my favorite feature would be the ability to set custom window rules for each application or even each sub-window within an application. Setting rules that dictate the size and placement of that app's windows, their transparency, which virtual desktop they open in, whether they show up in the taskbar or not, whether other windows can cover them up or not, etc. I use those rules extensively in my workflow to make sure each app always goes exactly where I want it on my multiple monitors, stays there, and behaves just how I want it to. (For example, I want my system monitor to be 80% translucent in a certain corner of the screen. I want my timer app to always stay on top, and in a particular location on a particular screen, I want my time tracking spreadsheet open on all desktops, but always in the background so it never covers any other window, and not cluttering up the taskbar. I want the terminal to always open maximized on my left monitor, and for it to be 100% visible when active, but 80% translucent when not active. With window rules, I can make all of that happen.)