ComfyUI-INT4-Fast brings INT4 inference to ComfyUI

ComfyUI-INT4-Fast enables ultra-fast W4A4 INT4 inference in ComfyUI, optimized for low-VRAM GPUs like the 6GB RTX 3060. The custom node package is a standalone adaptation of BobJohnson24's work, supporting Krea2 Turbo INT4 Convrot models.