You might also want to add a delay at the end of the animation before looping. As it is you only see the end result for a single frame.
Slow it a bit down too while you are at it.
How did you make the demo? I'd love to put something similar on http://ipinfo.io
Using tty2gif, I've made it work at my mac. Only need to find some time to upload the changes to the repo.
http://z24.github.io/tty2gif/
tty2gif author here. Could you send me a pull request about your mac version? I can merge them if I have time. Thanks for your efforts!
make it not loop!
Or at least add a delay at the end. It's not super hard to figure out what must be going on, but really the only thing you have time to see is the first line.