This aspect of gifs has bugged me for years, thank you for doing something about it! I think I'll run every gif served from my NAS through it.
I don't get why software like browsers, which play both videos and gifs, show progress bars for one and not the other. Particularly now that tiny videos without audio tracks are beginning to replace gifs, and browsers still show progress bars for those. The only software I've ever seen display gifs with progress bars is mpv (and I suspect that was an unintended consequence of their system, not a deliberate design decision.)
I don't get why software like browsers, which play both videos and gifs, show progress bars for one and not the other. Particularly now that tiny videos without audio tracks are beginning to replace gifs, and browsers still show progress bars for those. The only software I've ever seen display gifs with progress bars is mpv (and I suspect that was an unintended consequence of their system, not a deliberate design decision.)