I have a very cool Core 2 Duo laptop here that runs Linux Mint.
And it is pretty aweful. Would love to put Fedora Kinoite (Atomic KDE) on there, manual upgrades on shutdown, minimal set of apps.
But I dont know how well Plasma works on such old hardware. It is pretty bloated and messy sometimes, Dolphin and plasmashell are my biggest worries (the whole panel and widget stuff is sooo complex).
Has anyone tried Plasma?
An alternative would be LXQt with KWin once 6.1 comes out and it has full Wayland support.
I tried it on a real old vista laptop once and it ran terrible, but so did everything that wasnt XFCE. But a core 2 duo might be able to run it acceptably. I say give it a try :)
I've used KDE on a Thinkpad T60, it's about 17 years old, has 3GB of RAM, and a Core Duo. It ran surprisingly well. Replacing the HDD with a SSD can also make a noticeable difference, so you should consider that if you haven't already. I also turned off a lot of the animations and effects for better performance.
@boredsquirrel
While tedious, those effects can all be turned off in *"Workspace Effects" or whatever it's called. Not at my laptop to check. @Mint_Raccoon
I have KDE installed on a Core 2 Duo Tower. It runs fine most of the time. About the biggest thing you can get to make that generation of machine Snappy and more livable is an SSD. If you are still running on spinning rust there's no way any machine is going to be considered usable by today's standards.
I don't believe during the core 2 Duo days terabyte hard drives were a thing or at least all that common. I know I was upgrading with 128 and 256 GB drives. So that is very possibly and upgrade itself. But unless your laptop is your main system where all your data has to reside. Or you're going to be using it for mobile video editing? Which would be pretty sketchy with a core 2 Duo. I'd honestly recommend getting a 256 GB cheap SATA SSD toss the two terabyte drive in a computer on the network to share it with the laptop if you need the storage. That's what I've done with the laptop I use. Though it's new enough to have nvme storage. But all my other data is shared over my local network via NFS
I've had bad experiances. Started the pc on mint with cinimon, but that had some issues so I installed xfce and plasma to see if another environment may work. Xfce worked like a dream but plasma was quite laggy.
I'd say plasma has similar or possibly mildly better performance than win10. Any time I put it on older hardware it seems to bog it down quite a bit
I observed that the first boot of a new plasma install is quite slow, so that you wonder if it was a good idea to install plasma.
But once everything is up, it will be surprisingly fast from that on, and it stays that fast after reboot. So, be patient you fire it up the first time ....