@yasu Kinda mix of both.
Super + arrows were replaced by super + HJKL for example, so I had to get used to that.
But I've been using Vim keybindings for years already, so it wasn't really a big deal.

And I already saw that website, but the problem isn't just an illusion to be honest.
It really if RAM is 6 GiB used, and you load another 1.5 GiB, the PC starts getting instable and ultimately crash.
And this RAM problem on i3 I had seems to be limited to the X200, not X250.

Another thing I noticed is that X250 handles transparency blur via Picom just fine, whereas X200 gets a total meltdown the moment Picom is enabled with the same config, so I can't use blur on it (though at least I can use transparency).
So I think that might be a contributor to the problem.