notable delay (up to 2 seconds) before showing pop-ups (right-click menus or tooltips) or indows
My GNOME Shell 3.28.0 I sometimes delays the appearance of new windows by a time span of up to 2 seconds. A reboot fixes the problem.
The delay isn't caused by swapping on out-of-memory due to #64 (closed) and my system runs on wayland.