Bug#893717: gnome-shell: Poor performance with wayland after upgrading to 3.28

[Sam Morris]

Followup-For: Bug #893717
Control: reassign -1 mutter/3.28.0-1
Control: affects -1 gnome-shell
Control: tag -1 + upstream
Control: forwarded -1 https://bugzilla.gnome.org/show_bug.cgi?id=745032

Given the recent comments on that GNOME bugzilla, this is probably a
long running issue that has become much worse in 3.28.