SUMMARY Global Application shortcuts (like `M+.` for emojier) add about 100ms delay in comparison to pinning the app in taskbar and using `Win+number` shortcut. That is, launching emojier with `M+.` is noticeably slower for me than pinning it and launching a new instance via `Win+1` STEPS TO REPRODUCE The delay is visible with a nacked eye, especially if you compare two kinds of shortcuts (xclock is a guinea pig). But I also confirmd that with time measurments using these two scripts click.sh logs current time and uses ydotool to send `F4` shortcut ``` #!/bin/sh date +%s.%N >> "/home/matklad/tmp/log.txt" ydotool key 62:1 62:0 ``` clock.sh logs current time ``` #!/bin/sh date +%s.%N >> "/home/matklad/tmp/log.txt" echo "\n" >> "/home/matklad/tmp/log.txt" ``` If I bind F4 to global script shorcturt ``` [clock.sh.desktop] _k_friendly_name=clock.sh _launch=F4,none,/home/matklad/tmp/clock.sh ``` the result looks like this ``` 1681339791.367891270 1681339791.488687436 \n 1681339792.845658459 1681339792.964949291 \n 1681339793.893609292 1681339794.015043447 ``` That's about 120ms of delay between click.sh and clock.sh If I find F4 to task manager ``` activate task manager entry 1 ``` the result looks like this ``` 1681340227.988185176 1681340228.001887438 \n 1681340229.466190483 1681340229.482717773 \n 1681340230.419816890 1681340230.437328642 ``` about 20ms of delay, 100ms faster than the global shortcut SOFTWARE/OS VERSIONS Operating System: NixOS 23.05 KDE Plasma Version: 5.27.4 KDE Frameworks Version: 5.105.0 Qt Version: 5.15.8 Kernel Version: 6.2.10 (64-bit) Graphics Platform: Wayland Processors: 20 × 12th Gen Intel® Core™ i7-12700H Memory: 62.5 GiB of RAM Graphics Processor: Mesa Intel® Graphics Related issue: https://bugs.kde.org/show_bug.cgi?id=468328
I haven't measured it, but https://invent.kde.org/plasma/kglobalacceld/-/merge_requests/3 could help here since it cuts out an intermediate helper process
>could help here since it cuts out an intermediate helper process Aha, I think this helper process would explain 100% of the slowness I observe. On my system, spawning any plasma-related processes is very slow: ``` $ t kstart -h <SNIP> real 339.00ms cpu 171.86ms (127.87ms user + 43.99ms sys) rss 94.29mb ``` I fixed that dowstream (https://github.com/NixOS/nixpkgs/issues/225871), so I think it's fair to say that there's no "global shortcuts are slow" bug in plasma after all. Still, getting rid of an intermediate process feels like a good idea regardless!
ah, that explains a lot.
"so I think it's fair to say that there's no "global shortcuts are slow" bug in plasma after all." Well, after your tip on using Meta+1, Meta+2 to launch apps, I started using that, and it "seems faster" than "global application shortcuts" even on Gentoo and Arch. I say "seem faster" because timing kstart here gives around 70~80ms delay, so its hard to measure it really. So at the end this will improve things :) Thanks for reports this bug and fixing nixos side and Thanks KDE devs for improving KDE all the time! :)