The only thing that stands out as really odd besides to filesystem and indexation related daemons is
efilogin-helper hoovering around 50%-100% all of the time. The only hints I find on Google are about the wallpaper which I've reset to solid blue, so my system doesn't use that anymore.
I would like to not only have a practical solution to
efilogin-helper taking a lot of CPU but also maybe understand a bit more about troubleshooting these kind of problems.