Why we call it fast_SD and what's the difference from Automatic1111

[sanghyun0927]

Sorry to be dumb, Absolute newbie here.

Can some answer the reason we call it fast-SD and What is the difference between this repository and automatic 1111

[TheLastBen]

A1111 is a webui repo and this is a colab that uses A1111.
I called it fast back in the day when xformers was fresh out and this colab was the only one that implemented it.