> NixOS has a longstanding issue where library loading (and therefore program start, particularly GUI programs that load a lot) is n^2, but programs still all start in ~1 second or less on my n100 minipc. I still found that to be annoying enough to look into why it seemed so slow (and learned about the loading issue). Can't imagine things taking so long that you actually switch to another task. The same minipc can easily handle my 4k 240hz HDR monitor as well, and the whole experience is completely smooth.

KDE actually solved that long time ago with kdeinit (https://web.archive.org/web/20010517071320/www.suse.de/~bast... and follow-up work by Lubos, see e. g. https://conference2005.kde.org/slides/kde-performance/index....), but the new crop of developers didn't notice much difference on their high-end systems with SSDs, so they ripped it out.