Yes, yes, I know, buy AMD, but I already have nVvdia to use CUDA, but this new patch on the nightly branch (on arch, you can use sunshine-git but with my patch here: https://aur.archlinux.org/packages/sunshine-git) finally makes it so that I don't have to "dual boot" into X11 to get game streaming at full performance.
Prior to this, wayland-based streamers had to make a round-trip through CPU ram, and now it stays within GPU ram and thus we can stream 4k on nvidia/Wayland!
I also use krunner but unless I've misconfigured it, I wouldn't call it fast (and it freezes a lot since it runs in the background).
Compared to when I used rofi on hyprland (which was really fast). I'm back on KDE cause of the hyprland toxicity debacle, and honesty the only thing that isn't fast, customizable, and reliable is the app runner.
Krunner also has a weird quirk where as it loads entries, it will change the currently selected option so when you hit Enter, it will actually not execute the one you want, but instead run "Install "
Talking out loud I should probably bind alt+space to back to rofi or try Fuzzel or something