Hello Guix! I am having this issue for a long time, even before last 'core-updates' --> 'master' merge. So whenever I am watching video on mpv or icecat or ungoogled-chromium, if do fast-forward or fast-backward few times, the stuttering starts right away. By stuttering I mean, stuttering in system-wide. That is, stuttering happens in 1) playing media 2) switching windows 3) opening new applications 4) browsing menus etc. Like stuttering happens every- where, not just on playing video. It is like whole system slows down. Then I will have to restart the system to get things to normal. Even logout/login did not work. There is one deviance though, while playing media in ungoogled- chromium, I do not have to do fast-forward/backward; the stuttering starts just in few minutes after starting the video. I am not sure whether problem is with gnome, xorg or something else. When I looked at System Monitor during the stuttering, the processes "..gnome-shell-r", ".gnome-system-m" and "X" shows intermittent CPU% as 100. Regards, RG.