> there are fades in the interface that cannot seem to be disabled. Unjustifiable.
That's an accessibility option. GNOME Settings -> Accessibility -> Enable Animations; or `gsettings set org.gnome.desktop.interface enable-animations false`. Should apply everywhere.
Yes, but it does not disable the fades, nor all the gratuitous animations I see in the GUI of gnome-font-viewer (one of the very few pieces I can try not having uninstalled it). Those animations must have been hardcoded in the software, it must probably be recompiled - and I do not take it for granted they can be disabled through a configuration flag.
I just tried it and it disabled the fades. Maybe you made a typo in the setting? Most GNOME apps are not going to have animations hardcoded, they typically use standard widgets like GtkStack or GtkRevealer that handle the animations automatically and respect the system setting. You can verify this by opening the GTK inspector in Font Viewer.
Before posting I tried `gsettings get org.gnome.desktop.interface enable-animations` and it returns 'false', consistently (as it should) with `dconf-editor` used to see the options. And I verified (as I just re-did) the behaviour of `gnome-font-viewer`: changing the window content (switching the font) fades (messily) from former to latter, using the menu animates a "pull-down", activating the search slides down the interface...
That's an accessibility option. GNOME Settings -> Accessibility -> Enable Animations; or `gsettings set org.gnome.desktop.interface enable-animations false`. Should apply everywhere.