this post was submitted on 20 Feb 2026
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Unused ram is wasted ram. Change my mind
"i paid for the whole RAM imma use the whole RAM"
βme in 2010 using console commands to turn off all the particle effects in Portal so that I could boost my fps to ~20 w/ minimum settings (the laptop did not have a graphics card lmao)
Basically a zoetrope at that point.
Reminds me when I first started pc gaming. I even doubled my RAM to 512mb! I found a mod that basically turned everything into basic polygons where the walls were just red planes, characters looked like minecraft, the guns looked like they were done by a brutalist architect after being verbally described to them. Ran a mean 45 fps, but you had to use something like CCleaner to clear the ram in between rounds.
This applies when RAM is used as temporary cache or something that can be instantly freed the moment it is needed otherwise. This doesn't really work for justifying higher RAM use by KDE, unless you would never need that RAM for anything else anyway.
I use KDE because it is good, though. Also I don't think KDE even uses more RAM than other DEs that are designed to be lightweight. Last time I compared, it used the same or less memory as LXDE.
Firefox without any website loaded uses more RAM than a full Plasma session.
And KDE can be even more efficient if you go into the settings and tweak things a bit, turning off some unnecessary features that are on by default.
Which features? Asking because I switched recently to Linux.
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.)
Which features are unnecessary I meant. π
The difference being that in the one of those cases you still need to open a browser instance before you are able to browse the web.
Yep. KDE is feature-rich, but it's also highly optimized these days, and the RAM usage is actually competitive with the best of them.
You can get RAM usage lower on a very stripped down, barebones system, but if you want a full 'normal computer' desktop experience that has all the things you'd expect a computer to have, you'd be hard-pressed to find one that uses significantly less RAM than KDE. (Yes, there are some that get lower ... but not a lot lower. And unless you're running on some extremely limited hardware, are those extra 20MB of RAM really going to make a difference in your everyday life?)
Also, higher ram usage by programs makes it less likely that their actively used RAM (ie what it is actually currently using) fits in your CPUs caches, making them run slower.
It's just really oversimplifying memory usage. OS designers had that same thought decades ago already, so they introduced disk caching. If data gets loaded from disk, then it won't be erased from memory as soon as it isn't needed anymore. It's only erased, if something else requests memory and this happens to be the piece of "free" memory that the kernel thinks is the most expendable.
For example, this is what the situation on my system looks like:
Out of my 32 GiB physical RAM, 25 GiB happens to be usable by my applications, of which:
used),buff/cache), andfree).If you run
cat /proc/meminfo, you can get an even more fine-grained listing.I'm sure, I could get the number for actually unused memory even lower, if I had started more applications since booting my laptop. Or as the Wikipedia article I linked above puts it:
So, if you launch a memory-heavy application, it will generally cause memory used for disk caching to be cleared, which will slow the rest of your system down somewhat.
Having said all that, I am on KDE myself. I do not believe, it's worth optimizing for the speed of the system, if you're sacrificing features that would speed up your usage of it. Hell, it ultimately comes down to how happy you are with your computer, so if it makes you happy, then even gaudy eye-candy can be the right investment.
I just do not like these "unused RAM is wasted RAM" calls, because it is absolutely possible to implement few features while using lots of memory, and that does slow your system down unnecessarily.
I read this same principle in an arch or gentoo forum/manual. I can't even think of an argument against it tho? Unused anything is wasted by definition isn't it? I know I'm missing something obvious somehow
The problem with the simplified phrase is that your computer is expected to run more than one program at a time.
If you are only running one program, it should certainly use all the RAM of your system.
However, your desktop, laptop, phone, tablet, game console, etc. all run hundreds or thousands of programs at the same time. Each individual application should optimize RAM usage so the whole system can work together.
Another commenter in the chain talks about disk caching, which is what the phrase "unused ram is wasted ram" came from
It's been coopted by application programmers who don't want to optimize their software
Well, e. g. unused weapon is not really waste, is it?
what? yes, an unused weapon is still a wasted weapon. I know I'm missing something tho
Maybe it is a wasted weapon, but is it really a waste? Can weapon be considered wasted?
Can we try a different example or a declarative statement that negates my implied claim that in any case where a thing is unused, it must be categorized as waste by definition? The previous questions seem obviously clarifying of nothing. I know they're probably clarifying once your point is known, but because the point remains unknown to me, I can only perceive them as empty Socratic dialogue? I know it's not, I'm just trying to express more definitively how confused I'm getting lol
I got plenty of ram. Weβre using it.