The "ready" notifications were historically related to focus stealing prevention. So I expect they happen within a fraction of a second of using a keyboard or keyboard-like device. The shell is trying to avoid popping up a window in front of you when it thinks you're typing somewhere else.
Bug 1825710 declared the problem fixed, but looking upstream it sounds like they just implemented a new interface that apps must manually adopt. So that's not really a fix. It feels like bug 1825710 needs reopening(?) ** Package changed: gdm3 (Ubuntu) => gnome-shell (Ubuntu) ** Changed in: gnome-shell (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2084505 Title: gnome : An open application reopen leads to a message Box : Application is ready To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/2084505/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs