The fastest GIF does not exist
I checked ImageMagick, and was somewhat surprised they don't note this at all.<p>On this page, for example: <a href="https://legacy.imagemagick.org/Usage/anim_basics/" rel="nofollow">https://legacy.imagemagick.org/Usage/anim_basics/</a> , scroll down to "-delay", and it just says <i>"Set the time delay (in 1/100th of a second)..."</i>