That's definitely a bug. It's instant for me.
But I do think some of the systray things are overly complicated. E.g. why does the volume widget list all audio outputs and inputs by default?
On the other hand some things are really great. E.g. which other DE lets you adjust the screen brightness (the real one via DDC/CI) from the systray, or start video screen capture by pressing print screen?
KDE is definitely better than gnome at this point.
> E.g. which other DE lets you adjust the screen brightness (the real one via DDC/CI) from the systray, or start video screen capture by pressing print screen?
Both of these work for me on Gnome 49.
I've encountered the same KDE bug in NixOS though from what I understood when I did some digging[0][1] it doesn't manifest on distros like Fedora.
Now I'm using Cinnamon until the bug gets fixed which I enjoy too but it doesn't come close to the ease of use of KDE. And when I say ease of use on KDE I refer to the fact that out of the box you can pretty much do everything you need to without having to search for extensions or hunt for settings, someone already thought of what you wanted to do and made it straightforward to do. Sure it's overwhelming to be presented with a lot of things at once e.g. the screen capture UI but when you need to do something that's not the base case it's easy to see that the UI has got you covered.
[0]: https://www.reddit.com/r/NixOS/comments/1pdtc3v/kde_plasma_i...
[1]: https://github.com/NixOS/nixpkgs/issues/126590