Celluloid 0.27, a GTK frontend for mpv, updates the user interface in floating-mode, adds a loading screen, improves launch performance, optimizes the preferences' dialog, updates deprecated GTK API usage, and supports multi-file user scripts.
https://alternativeto.net/news/2024/6/celluloid-0-27-released-with-improved-floating-mode-user-interface-and-faster-launch-times/