With Clutter 1.25.6, swap throttling is now enabled for full-screen windows with the GDK back-end. This change is designed to avoid performance penalties with the GDK back-end for constrained devices where running fullscreen Clutter and Clutter-GTK applicatons.
Clutter 1.25.6 also adds support for platform-specific data to the libinput input back-end, which is necessitated for writing Wayland compositors based on Clutter and implementing higher-level functionality.
This Clutter update also has bug fixes and other changes. More details via the GNOME announce list.