I would guess that Linux doesn't slow down the more one runs it like Windows does, because there is no registry in Linux. But if anything, surely installing updates and other software would cause it to slow down, even if not noticeably? It seems to me that certainly on an HDD, the more space an OS takes up on a partition, the further the "arm" with the laser (not sure what the technical term for it is) on it, has to move, to read and write to directories on the HDD.
Kubuntu 14.04 is the OS I have had installed the longest; since not long after it was released, and I haven't noticed it getting faster. It takes quite a bit longer to boot up than Mint 17.1 Xfce, which I have installed on another partition on the same computer, but then Kubuntu is now over 12GiB because of all the software I've installed to it, whereas Mint is less than half the size because I only installed it recently and have installed hardly any software to it.
Kubuntu 14.04 has some process (python3 I think) which runs at 100% in one core, for a few seconds, every time it boots up. What it's started doing recently is after it does this, the same process then runs in the other core of the CPU for a few seconds, whereas it didn't used to. So I'm guessing this process is designed to use one core for a few seconds, then switch to another one if it hasn't finished doing whatever it does, and so the reason I am seeing this happening is because the process is taking longer to do whatever it does, than it used to.
So I would be interested to hear, if anyone here knows, how it is that Linux is supposed to get faster the more one uses it.
Edited by Al1000, 09 February 2015 - 07:21 AM.