STEPS TO REPRODUCE 1. use Wayland session 2. open OBS Studio 3. add 'Screen capture (Pipewire)' source to OBS Studio 3. open System Activity by pressing ctrl+esc and observe cpu usage of kwn_wayland OBSERVED RESULT cpu usage of kwin_wayland is 10% while OBS Studio is running. After closing OBS Studio, cpu usage immediately decreases to 1% or 2%. EXPECTED RESULT normal cpu usage while OBS Studio is running SOFTWARE/OS VERSIONS Operating System: KDE neon Unstable Edition KDE Plasma Version: 5.23.80 KDE Frameworks Version: 5.89.0 Qt Version: 5.15.3 Kernel Version: 5.11.0-40-generic (64-bit) Graphics Platform: Wayland Processors: 4 × Intel® Core™ i3-3110M CPU @ 2.40GHz Memory: 7,7 GiB of RAM Graphics Processor: Mesa DRI Intel® HD Graphics 4000
For KWin there's no difference between OBS running and getting the output stream, and OBS actually doing something with that output stream. In both cases it does exactly the same amount of work. 10% CPU usage for a video stream sounds like too much though
*** This bug has been marked as a duplicate of bug 471364 ***
*** This bug has been marked as a duplicate of bug 469777 ***